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costco.ca

costco.ca is SSL secured

Free website and domain report on costco.ca

Last Updated: 7th November, 2022 Update Now
Overview

Snoop Summary for costco.ca

This is a free and comprehensive report about costco.ca. Costco.ca is hosted in New York, New York in United States on a server with an IP address of 23.10.90.116, where the local currency is USD and English is the local language. Costco.ca is expected to earn an estimated $7,826 USD per day from advertising revenue. The sale of costco.ca would possibly be worth $5,713,199 USD. This figure is based on the daily revenue potential of the website over a 24 month period. Costco.ca is insanely popular with an estimated 840,554 daily unique visitors. This report was last updated 7th November, 2022.

About costco.ca

Site Preview: costco.ca costco.ca
Title:
Description:
Keywords and Tags: costco calgary, costco canada, costco canada online, costco logo, costco rain barrel, fw1 cleaning wax, hunter douglas blinds costco, ninja air fryer, online shopping, popular, tankless water heater costco, the case full of seoul
Related Terms: balacera en costco, costco instacart, costco near me
Fav Icon:
Age:
Domain Created:
Domain Updated:
Domain Expires:
Review

Snoop Score

4/5 (Excellent!)

Valuation

$5,713,199 USD
Note: All valuation figures are estimates.

Popularity

Very High
Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank: 2,770
Alexa Reach: 0.0169%
SEMrush Rank (US): 17,763
SEMrush Authority Score: 70
Moz Domain Authority: 67
Moz Page Authority: 56

Rank By Country

Country Alexa Rank
Canada Flag Canada 58
Germany Flag Germany 18,274
France Flag France 8,652
United States Flag United States 5,682

Organic vs Paid (Google Ads)

Organic Paid
Keywords: 506,813 0
Traffic: 143,373 0
Cost: $49,713 USD $0 USD
Traffic

Visitors

Daily Visitors: 840,554
Monthly Visitors: 25,583,807
Yearly Visitors: 306,802,106
Note: All visitors figures are estimates.

Visitors By Country

Country Visitors (Unique) Percentage
Canada Flag Canada Daily: 701,862
Monthly: 21,362,479
Yearly: 256,179,758 		83.5%
Germany Flag Germany Daily: 5,043
Monthly: 153,503
Yearly: 1,840,813 		0.6%
France Flag France Daily: 7,565
Monthly: 230,254
Yearly: 2,761,219 		0.9%
Other Daily: 29,419
Monthly: 895,433
Yearly: 10,738,074 		3.5%
United States Flag United States Daily: 96,664
Monthly: 2,942,138
Yearly: 35,282,242 		11.5%
Note: All visitors figures are estimates.
Revenue

Revenue

Daily Revenue: $7,826 USD
Monthly Revenue: $238,208 USD
Yearly Revenue: $2,856,595 USD
Note: All revenue figures are estimates.

Revenue By Country

Country Revenue Percentage
Canada Flag Canada Daily: $2,907 USD
Monthly: $88,465 USD
Yearly: $1,060,875 USD 		37.1%
Germany Flag Germany Daily: $31 USD
Monthly: $942 USD
Yearly: $11,300 USD 		0.4%
France Flag France Daily: $26 USD
Monthly: $783 USD
Yearly: $9,389 USD 		0.3%
Other Daily: $0 USD
Monthly: $0 USD
Yearly: $0 USD 		<0.1%
United States Flag United States Daily: $4,863 USD
Monthly: $148,017 USD
Yearly: $1,775,030 USD 		62.1%
Note: All revenue figures are estimates.
SEO

Backlinks Analysis (SEMrush)

Backlinks: 2,056,618
Referring Domains: 10,239
Referring IPs: 11,196
Costco.ca has 2,056,618 backlinks according to SEMrush. 87% of these backlinks are "dofollow" (follow) links which allow the flow of link equity to pass through, which may improve costco.ca's search engine rankings. Other links are treated as 'hints' by search engines and may also pass link equity, depending on what search engines decide in each case.
100% of costco.ca's backlinks are text and image links, which are ideal for SEO. Other backlink types may be unrecognized or ignored by search engines.

Top New Follow Links

1
Source: https://www.costcobusinesscentre.ca/health-beauty.html
Target: https://customerservice.costco.ca/app/answers/detail/c/10/a_id/392
2
Source: https://www.costcobusinesscentre.ca/seasonal.html
Target: https://customerservice.costco.ca/app/answers/detail/c/10/a_id/392
3
Source: https://www.chevrolet.ca/en/promotions
Target: https://costco.ca/#
4
Source: https://www.vapepen.xyz/jump-starter-canada.asp
Target: https://www.costco.ca/boostmi-pro-portable-jump-starter-and-personal-power-supply.product.100410499.html
5
Source: https://www.vapepen.xyz/jump-starter-canada.asp
Target: https://www.costco.ca/boostmi-pro-portable-jump-starter-and-personal-power-supply.product.100410499.html

Top Ranking Keywords (US)

1
Keyword: costco canada
Ranked Page: https://www.costco.ca/
2
Keyword: ninja air fryer
Ranked Page: https://www.costco.ca/ninja-air-fryer.product.100463968.html
3
Keyword: fw1 cleaning wax
Ranked Page: https://www.costco.ca/fw1-exterior-wash-and-wax--4-pack.product.100376338.html
4
Keyword: costco canada online
Ranked Page: https://www.costco.ca/
5
Keyword: tankless water heater costco
Ranked Page: https://www.costco.ca/water-heating.html

Domain Analysis

Value Length
Domain: costco.ca 9
Domain Name: costco 6
Extension (TLD): ca 2

Page Speed Analysis

Average Load Time: 1.57 seconds
Load Time Comparison: Faster than 48% of sites

PageSpeed Insights

Avg. (All Categories) 59
Performance 33
Accessibility 98
Best Practices 0
SEO 83
PWA 22
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://www.costco.ca/
Updated: 7th November, 2022

0.93 seconds
First Contentful Paint (FCP)
93%
5%
2%

0.01 seconds
First Input Delay (FID)
92%
5%
3%

Simulate loading on desktop
33

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for costco.ca. This includes details about optimizing page load times which can result in a better user experience.

Other

Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Costco.ca should consider minifying CSS files.
Minify JavaScript — Potential savings of 5 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Costco.ca should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
inline: window.adobeopt = window.adobeopt || { ...
10650
5350
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 210 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://www.costco.ca/
211.242
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Costco.ca should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 21 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
7737
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/5587.e6b06404.chunk.js
6773
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
6536
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4950.d33cd039.chunk.js
83
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
56
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
53
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6189.49aa4085.chunk.js
45
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.
Avoid chaining critical requests — 5 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Costco.ca should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
All text remains visible during webfont loads
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
Keep request counts low and transfer sizes small — 285 requests • 4,319 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
285
4422564
Script
98
1786351
Image
119
1726007
Other
60
643179
Document
2
150510
Stylesheet
6
116517
Media
0
0
Font
0
0
Third-party
159
2697877
Minimize third-party usage — Third-party code blocked the main thread for 0 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
352788
1.372
SHOW DETAILS
312712
0
SHOW DETAILS
103467
0
SHOW DETAILS
35681
0
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Sony 65-in Class - X90K Series - 4K UHD LED LCD TV Starting at $1,398.99 delive…
Largest Contentful Paint image was not lazily loaded
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint.
Element
Sony 65-in Class - X90K Series - 4K UHD LED LCD TV Starting at $1,398.99 delive…
Avoid large layout shifts — 2 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
Inova Car and Home Insurance. Complete your quote and buy online now!
0.15843965141168
Save on the Best Brands in Televisions Savings on Appliances Continue Limited t…
0.062410928944533
Avoid long main-thread tasks — 18 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
4940
224
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
621
187
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
4443
185
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
5446
170
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
447
162
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
813
147
https://www.costco.ca/wcsstore/RWDStaticAssets/js/vendor/lozad/lozad.min.js
4220
123
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
1167
119
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
293
69
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
4343
68
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
4723
65
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
385
62
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
4628
60
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
236
56
https://media-cdn.costco.ca/app-costco.js?v=20201211
1053
51
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
1381
51
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
1445
51
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
5655
51
Avoid non-composited animations — 4 animated elements found
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Element Name
Postal Code
Postal Code
Cookie Preferences
We use strictly necessary cookies to make our Sites work. In addition, if you c…
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of costco.ca on mobile screens.
Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Audits

Network Requests
Below is a list of network requests that were made during page load.
URL Protocol Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://costco.ca/
http/1.1
0
117.39899998065
292
0
302
text/plain
https://www.costco.ca/
h2
117.70100006834
327.95099995565
76171
501057
200
text/html
Document
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/css/rwd.app.home.min.css
h2
346.66999999899
439.40599996131
56637
291458
200
text/css
Stylesheet
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
h2
346.95100004319
390.74100006837
33514
98321
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
h2
347.25300001446
441.08100002632
71622
249588
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
h2
347.72700001486
405.97399999388
50396
206824
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
h2
347.98800002318
386.66399999056
1883
4233
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js
h2
348.21399999782
378.6610000534
2244
4688
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js
h2
348.5759999603
368.87400003616
4328
14495
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/cot.module.min.js
h2
349.00200006086
383.85199999902
1513
3299
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js
h2
349.25500000827
447.50300003216
1323
2109
200
application/x-javascript
Script
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js
h2
556.18700000923
579.78000002913
8029
21748
200
application/javascript
Script
https://www.costco.ca/wcsstore/RWDStaticAssets/js/vendor/lozad/lozad.min.js
h2
350.06099997554
403.04500004277
1551
3094
200
application/x-javascript
Script
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
h2
350.33599997405
361.17799999192
113554
429323
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/RWDStaticAssets/react-variant/wiocommon.js
h2
351.25800000969
516.17800001986
1231
2941
200
application/x-javascript
Script
https://media-cdn.costco.ca/app-costco.js?v=20201211
http/1.1
351.40200005844
469.29000003729
15557
55960
200
application/javascript
Script
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco-Wholesale-Canada.svg
h2
556.62100005429
603.45100006089
3535
7299
200
image/svg+xml
Image
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco_Canada_Logo.png
h2
557.02900001779
582.39600004163
7939
7511
200
image/png
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-lgban-221107-costco-shop-card-en.jpg
h2
557.37100006081
597.16000000481
21166
20770
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/sm-half-ban-220704-nonmember-en.jpg
h2
557.52799997572
596.75100003369
9460
9066
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/sm-half-ban-220704-renew-en.jpg
h2
557.81999998726
632.17700005043
11654
11258
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190401-ITW-en.jpg
h2
557.97900003381
596.47500002757
3432
3044
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190401-TH-en.jpg
h2
558.14600002486
660.86599999107
4634
4246
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190429-Hotbuys-en.jpg
h2
558.46199998632
660.53200000897
3942
3554
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/22cweb1303-GG-redesign-homepageFeat-en.jpg
h2
558.70599998161
677.51499998849
4066
3632
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-tvs-pre-black-friday-en.jpg
h2
558.92900004983
732.6480000047
8735
8340
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-220103-appliances.jpg
h2
559.24700002652
733.06900006719
10879
10484
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-computer.jpg
h2
559.39399998169
683.36100003216
7193
6798
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-en.gif
h2
559.51100005768
759.64000006206
26458
26022
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-toms.jpg
h2
560.01799996011
759.22200002242
7652
7218
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-furniture-event-en.jpg
h2
560.38300006185
770.77000006102
6485
6050
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-membership-upgrade-en.jpg
h2
560.52199995611
771.27599995583
9681
9286
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-grocery.jpg
h2
560.70200004615
738.27700002585
13623
13188
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-GM-en.jpg
h2
561.02600006852
782.46100002434
12832
12436
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221003-elevon.jpg
h2
561.20500003453
783.04100001696
10614
10218
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221017-ks.jpg
h2
561.4030000288
839.31000006851
14860
14464
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-nellies.jpg
h2
561.82399997488
789.34899996966
3991
3598
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-01-en.jpg
h2
562.06300004851
941.46800006274
2901
2466
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-02-en.jpg
h2
562.33400001656
941.08300004154
3551
3116
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-03-en.jpg
h2
562.53100000322
599.03699997813
3289
2854
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/espot-180917-WP-en.jpg
h2
562.71299999207
599.35100004077
4719
4324
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-fullfeature-221001-CostcoOnline-en.jpg
h2
562.95100005809
598.73299999163
12157
11722
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-fullfeature-221001-CostcoOnline-en.jpg
h2
563.12700000126
699.00899997447
22340
21944
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/Costco-Grocery-E.png
h2
563.29499999993
636.13200001419
3813
3380
200
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h2
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h2
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h2
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h2
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h2
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Stylesheet
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h2
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h2
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h2
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h2
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h2
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h2
3942.4740000395
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image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/220208-RedBull2-en.jpg
h2
3942.7549999673
3942.9360000649
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image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/pharm-popover-shot.jpg
h2
3943.1999999797
3943.3440000284
1872
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image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/pharm-poover-pilldel.jpg
h2
3943.5039999662
3943.6439999845
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200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/cvp220901/Costco-Vehicle-Program-220901-drop-down-en.jpg
h2
3943.8520000549
3944.0119999927
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image/webp
Image
https://mobilecontent.costco.com/live/resource/img/photo-dropdown-221003/photo-dropdown-221003-en.jpg
h2
3946.1840000004
3946.4360000566
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image/webp
Image
https://mobilecontent.costco.com/live/resource/img/travel-dropdown-221021/travel-dropdown-221024-en.jpg
h2
3946.8689999776
3947.1360000316
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image/webp
Image
https://geocodeservice.costco.com/Locations?q=070&country=CAN
http/1.1
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text/plain
XHR
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h2
4150.5990000442
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application/json
XHR
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h2
4251.2850000057
4251.5920000151
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application/x-javascript
Script
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h2
4255.4910000181
4255.707000033
45128
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image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-hero-221107-furniture-en.jpg
h2
4255.9500000207
4256.1830000486
60020
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image/webp
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h2
4613.8770000543
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Script
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http/1.1
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XHR
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h2
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Script
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Script
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text/plain
XHR
https://geocodeservice.costco.com/Locations?q=070&country=CAN
http/1.1
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XHR
https://geocodeservice.costco.com/Locations?q=070&country=CAN
http/1.1
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text/plain
XHR
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application/x-javascript
Fetch
https://www.costco.com/wcsstore/CostcoUSBCCatalogAssetStore/styles/oo_tab_icon_retina.gif
h2
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h2
5300.6880000466
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Fetch
https://cdn.cookielaw.org/scripttemplates/6.35.0/assets/v2/otPcTab.json
h2
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https://cdn.cookielaw.org/scripttemplates/6.35.0/assets/otCommonStyles.css
h2
5302.1779999835
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text/css
Fetch
https://api.costco.com/ebusiness/inventory/v1/location/distributioncenters?destinationPostalCode=M4V+2H7
http/1.1
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application/json
XHR
https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg
h2
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Image
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http/1.1
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application/json
XHR
https://173bf110.akstat.io/
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0
0
-1
Ping
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http/1.1
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application/json
XHR
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http/1.1
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application/json
XHR
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http/1.1
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XHR
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http/1.1
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application/json
XHR
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http/1.1
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text/html
XHR
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
-2489.048
30.532
-2381.089
13.557
-2364.722
112.176
-2247.839
68.731
-2156.958
21.504
-2131.237
5.043
-2118.535
11.458
-2107.055
6.642
-2092.058
16.629
-2067.023
7.424
-2050.174
5.107
-2041.667
9.947
-2031.151
9.244
-2020.84
5.699
-2013.858
6.01
-2003.333
6.635
-1996.684
62.039
-1934.517
161.987
-1772.386
23.061
-1738.216
373.675
-1364.375
10.044
-1342.096
293.083
-1048.911
33.707
-1012.066
9.129
-997.092
18.508
-968.503
98.401
-870.066
15.33
-854.725
7.148
-832.343
50.717
-775.574
19.363
-752.569
6.709
-733.999
71.988
-660.944
17.455
-618.753
119.396
-497.415
5.149
-486.98
88.108
-389.242
11.276
-346.241
20.721
-324.666
19.295
-295.632
102.81
-192.761
12.844
-170.345
51.211
-118.071
5.859
-107.785
20.259
-43.166
43.811
107.622
5.748
113.405
44.433
225.26
9.98
236.229
135.081
380.939
64.291
454.92
13.767
473.849
6.23
480.089
5.244
486.92
19.097
510.961
59.981
587.056
10.421
598.425
6.334
604.953
7.652
618.749
16.968
638.815
16.157
660.321
12.953
673.845
185.113
864.58
448.256
1312.923
9.7
1334.689
8.517
1353.651
40.994
1398.36
8.382
1414.535
5.021
1433.579
245.318
1678.922
31.745
1714.359
10.129
1724.496
65.134
1793.477
42.626
1838.979
7.269
1848.911
340.97
2190.17
10.527
2205.807
7.129
2219.795
6.65
2228.217
94.907
2323.164
22.641
2354.838
8.055
2376.193
11.486
2391.342
32.687
2424.58
7.003
2434.365
6.559
2452.657
28.397
2489.878
46.43
2545.947
21.143
2569.847
5.926
2576.258
102.656
2689.848
26.868
2717.023
15.724
2737.486
5.582
2763.906
5.253
2781.204
6.338
2793.3
5.968
2799.293
41.988
2841.68
6.565
2907.095
11.06
2918.214
5.828
2961.441
7.022
3094.061
7.344
3102.224
41.588
3143.979
9.562
3270.754
5.121
3336.648
5.012
3540.908
5.163
3559.093
19.199
3578.333
17.66
3596.36
14.211
3610.616
10.545
3621.278
16.561
3638.198
15.708
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Metrics

First Contentful Paint — 1.6 s
The time taken for the first image or text on the page to be rendered.
Total Blocking Time — 330 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Audits

Max Potential First Input Delay — 220 ms
Users could experience a delay when interacting with the page.

Other

Eliminate render-blocking resources — Potential savings of 230 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Costco.ca should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
113554
200
Properly size images — Potential savings of 89 KiB
Images can slow down the page's load time. Costco.ca should consider serving more appropriate-sized images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/1070-21-card-art.png
38094
37635
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/instacart-logo-wordmark-en.png
14580
14369
https://media-cdn.costco.ca/www3-media/?libBID=3661145
31912
11200
https://media-cdn.costco.ca/www3-media/?libBID=3659721
27218
9553
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco_Canada_Logo.png
7511
6666
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-hero-221107-furniture-en.jpg
59624
6640
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-hero-221107-sony-tv-en.jpg
44692
4977
Defer offscreen images — Potential savings of 416 KiB
Time to Interactive can be slowed down by resources on the page. Costco.ca should consider lazy-loading offscreen and hidden images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/grocery-dropdown-FAQsplit-221104-en.png
61606
61606
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/220208-RedBull2-en.jpg
57136
57136
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/grocery-dropdown-FAQsplit-SD-220706-en.png
56010
56010
https://mobilecontent.costco.com/live/resource/img/static-us-landing-pages/instacart-logo-faq-20w09139.svg
49556
49556
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/1070-21-card-art.png
38094
38094
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/211201-gourmet-food-espot-en.jpg
34360
34360
https://media-cdn.costco.ca/www3-media/?libBID=3561909
28836
28836
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-fullfeature-221001-CostcoOnline-en.jpg
21944
21944
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/210914-button-a-en1.jpg
17388
17388
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/instacart-logo-wordmark-en.png
14580
14580
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-fullfeature-221001-CostcoOnline-en.jpg
11722
11722
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-sameday.png
4384
4384
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/espot-180917-WP-en.jpg
4324
4324
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-2day.png
3908
3908
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco-Wholesale-Canada.svg
3535
3535
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/Costco-Grocery-E.png
3380
3380
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-02-en.jpg
3116
3116
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-03-en.jpg
2854
2854
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-01-en.jpg
2466
2466
https://mobilecontent.costco.com/live/resource/img/ca-homepage/bottom-200203-KS-Logo.png
2362
2362
https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg
2322
2322
https://mobilecontent.costco.com/live/resource/img/ca-homepage/220627-auto-renew-logo-en.png
2132
2132
Reduce unused CSS — Potential savings of 66 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Costco.ca should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/css/rwd.app.home.min.css
56637
49947
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} ...
21125
18128
Reduce unused JavaScript — Potential savings of 191 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
87994
45353
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
50396
37845
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
71622
33919
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
120449
29912
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
113554
25955
https://s.go-mpulse.net/boomerang/V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU
50666
22730
Enable text compression — Potential savings of 128 KiB
Text-based resources should be served with compression, such as gzip, deflate or brotli.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.681&longitude=-79.399&limit=50&openingDate=2022-11-07
139318
131086
Reduce JavaScript execution time — 3.1 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://www.costco.ca/
837.39400000002
106.312
10.147
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
789.598
509.544
33.947
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
696.98
669.18
9.165
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
570.334
388.96
24.328
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
537.402
171.785
0.483
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
505.102
389.601
74.06
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
320.778
294.035
10.862
Unattributable
311.821
53.7
0
https://s.go-mpulse.net/boomerang/V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU
229.796
97.701
9.294
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
228.528
140.86
16.543
https://media-cdn.costco.ca/app-costco.js?v=20201211
119.36
36.768
3.116
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
61.035
40.988
10.478

Metrics

Time to Interactive — 4.9 s
The time taken for the page to become fully interactive.
Speed Index — 2.5 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 4.6 s
The timing of the largest text or image that is painted.
Cumulative Layout Shift — 0.78
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Audits

First Meaningful Paint — 2.0 s
The time taken for the primary content of the page to be rendered.

Other

Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Serve images in next-gen formats
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
Avoid multiple page redirects — Potential savings of 3,580 ms
Redirects can cause additional delays before the page can begin loading. Costco.ca should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://costco.ca/
3580
https://www.costco.ca/
0
https://www.costco.ca/
0
Avoid enormous network payloads — Total size was 4,319 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.681&longitude=-79.399&limit=50&openingDate=2022-11-07
140376
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.681&longitude=-79.399&limit=50&openingDate=2022-11-07
140336
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.681&longitude=-79.399&limit=50&openingDate=2022-11-07
140336
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
120449
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
120449
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
113554
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
113554
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
87994
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
87994
https://www.costco.ca/
76171
Serve static assets with an efficient cache policy — 109 resources found
Costco.ca can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://mobilecontent.costco.com/live/resource/img/static-us-landing-pages/instacart-logo-faq-20w09139.svg
0
49880
https://mobilecontent.costco.com/live/resource/img/static-us-landing-pages/instacart-logo-faq-20w09139.svg
0
49880
https://media-cdn.costco.ca/app-costco.js?v=20201211
1800000
15557
https://media-cdn.costco.ca/app-costco.js?v=20201211
1800000
15557
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
3600000
120449
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
3600000
120449
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
3600000
113554
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
3600000
113554
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
3600000
71622
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
3600000
71622
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
3600000
50396
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
3600000
50396
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
3600000
37925
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
3600000
37925
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RCaae2a996f45041258abe5c372be50544-source.min.js
3600000
34623
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RCaae2a996f45041258abe5c372be50544-source.min.js
3600000
34623
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
3600000
33514
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
3600000
33514
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6189.49aa4085.chunk.js
3600000
21064
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6189.49aa4085.chunk.js
3600000
21064
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC652838c14af0493a9c118be06eb67e49-source.min.js
3600000
17408
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/9361.e7bb9f80.chunk.js
3600000
15174
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/9361.e7bb9f80.chunk.js
3600000
15174
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/7365.e31b04df.chunk.js
3600000
13714
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/7365.e31b04df.chunk.js
3600000
13714
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4950.d33cd039.chunk.js
3600000
12333
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4950.d33cd039.chunk.js
3600000
12333
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4862.65a6adf4.chunk.js
3600000
9855
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4862.65a6adf4.chunk.js
3600000
9855
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/5587.e6b06404.chunk.js
3600000
7866
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/5587.e6b06404.chunk.js
3600000
7866
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1871.441d21a4.chunk.js
3600000
6637
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1871.441d21a4.chunk.js
3600000
6637
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/WarehouseSidebar.bbc27ae0.chunk.js
3600000
6226
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/WarehouseSidebar.bbc27ae0.chunk.js
3600000
6226
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/DeliveryLocation.96f22a1e.chunk.js
3600000
6160
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/DeliveryLocation.96f22a1e.chunk.js
3600000
6160
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4870.ee75d17a.chunk.js
3600000
5806
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4870.ee75d17a.chunk.js
3600000
5806
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4757.fa5a9c9c.chunk.js
3600000
5769
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4757.fa5a9c9c.chunk.js
3600000
5769
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6456.0c12a5c6.chunk.js
3600000
5008
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6456.0c12a5c6.chunk.js
3600000
5008
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4645.6ce7f1ea.chunk.js
3600000
4957
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4645.6ce7f1ea.chunk.js
3600000
4957
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/2966.6ab2bdda.chunk.js
3600000
4947
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/2966.6ab2bdda.chunk.js
3600000
4947
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4577.d88dc697.chunk.js
3600000
4864
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4577.d88dc697.chunk.js
3600000
4864
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js
3600000
4328
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js
3600000
4328
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1378.ece826b9.chunk.js
3600000
4268
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1378.ece826b9.chunk.js
3600000
4268
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/8418.dfa8f6ec.chunk.js
3600000
3858
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/8418.dfa8f6ec.chunk.js
3600000
3858
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco-Wholesale-Canada.svg
3600000
3535
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco-Wholesale-Canada.svg
3600000
3535
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/AccountMenu.087d1543.chunk.js
3600000
3365
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/AccountMenu.087d1543.chunk.js
3600000
3365
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/7064.945f3fa1.chunk.js
3600000
3268
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/7064.945f3fa1.chunk.js
3600000
3268
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6259.2fe32f01.chunk.js
3600000
2846
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6259.2fe32f01.chunk.js
3600000
2846
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/5946.3ee71060.chunk.js
3600000
2574
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/5946.3ee71060.chunk.js
3600000
2574
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1535.34d53d64.chunk.js
3600000
2537
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1535.34d53d64.chunk.js
3600000
2537
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1251.1ba72a5a.chunk.js
3600000
2386
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1251.1ba72a5a.chunk.js
3600000
2386
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js
3600000
2244
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js
3600000
2244
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
3600000
1883
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
3600000
1883
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-instagram.svg
3600000
1856
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-instagram.svg
3600000
1856
https://www.costco.ca/wcsstore/RWDStaticAssets/js/vendor/lozad/lozad.min.js
3600000
1551
https://www.costco.ca/wcsstore/RWDStaticAssets/js/vendor/lozad/lozad.min.js
3600000
1551
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/cot.module.min.js
3600000
1513
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/cot.module.min.js
3600000
1513
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC4251817aa6334f55882abe6b3ec6881b-source.min.js
3600000
1498
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC4251817aa6334f55882abe6b3ec6881b-source.min.js
3600000
1498
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js
3600000
1323
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js
3600000
1323
https://www.costco.ca/wcsstore/RWDStaticAssets/react-variant/wiocommon.js
3600000
1231
https://www.costco.ca/wcsstore/RWDStaticAssets/react-variant/wiocommon.js
3600000
1231
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC8ac508830e5240ee98f97b65f1eb62f3-source.min.js
3600000
1009
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC8ac508830e5240ee98f97b65f1eb62f3-source.min.js
3600000
1009
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC5f9e58d6560a4c28aeee4b736e390112-source.min.js
3600000
979
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC5f9e58d6560a4c28aeee4b736e390112-source.min.js
3600000
979
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-facebook.svg
3600000
908
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-facebook.svg
3600000
908
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC24f6983fcf294c44a3fb08052979344c-source.min.js
3600000
725
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC24f6983fcf294c44a3fb08052979344c-source.min.js
3600000
725
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
14400000
87994
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
14400000
87994
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js
14400000
8029
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js
14400000
8029
https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg
14400000
2322
https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg
14400000
2322
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
21600000
71910
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
21600000
71357
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/css/rwd.app.home.min.css
86400000
56637
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/css/rwd.app.home.min.css
86400000
56637
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/css/WarehouseSidebar.f519ce60.chunk.css
86400000
948
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/css/WarehouseSidebar.f519ce60.chunk.css
86400000
948
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/css/DeliveryLocation.cecd78b0.chunk.css
86400000
674
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/css/DeliveryLocation.cecd78b0.chunk.css
86400000
673
https://s.go-mpulse.net/boomerang/V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU
604800000
50666
https://s.go-mpulse.net/boomerang/V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU
604800000
50666
Avoid an excessive DOM size — 5,440 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
5440
Maximum DOM Depth
div.col-xs-6 > div.style-check > label > i.wl-gas-station
21
Maximum Child Elements
Appliance Parts & Accessories Commercial F…
1068
Minimize main-thread work — 5.5 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
3059.512
Style & Layout
779.869
Other
568.45699999999
Rendering
335.89700000002
Script Parsing & Compilation
281.536
Garbage Collection
248.553
Parse HTML & CSS
212.414
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Source
SHOW DETAILS
SHOW DETAILS
Avoid `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Source
SHOW DETAILS
Image elements do not have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.
URL
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/1070-21-card-art.png
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-hero-221107-sony-tv-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-hero-221107-furniture-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-hero-221107-mattress-en.jpg
https://media-cdn.costco.ca/www3-media/?libBID=3561907
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-lgban-221107-costco-shop-card-en.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/instacart-logo-wordmark-en.png
https://media-cdn.costco.ca/www3-media/?libBID=3659721
https://media-cdn.costco.ca/www3-media/?libBID=3661145
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-fullfeature-221001-CostcoOnline-en.jpg
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco_Canada_Logo.png
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-01-en.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-02-en.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-03-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190401-TH-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/22cweb1303-GG-redesign-homepageFeat-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-tvs-pre-black-friday-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-220103-appliances.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-computer.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-en.gif
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-toms.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-furniture-event-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-membership-upgrade-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-grocery.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-GM-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221003-elevon.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221017-ks.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-nellies.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/espot-180917-WP-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190401-ITW-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190429-Hotbuys-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/sm-half-ban-220704-nonmember-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/sm-half-ban-220704-renew-en.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/Costco-Grocery-E.png
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-sameday.png
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-2day.png
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-facebook.svg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/220627-auto-renew-logo-en.png
https://mobilecontent.costco.com/live/resource/img/ca-homepage/bottom-200203-KS-Logo.png
https://mobilecontent.costco.com/live/resource/img/ca-homepage/211206-connection-logo-en.jpg
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-instagram.svg
98

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of costco.ca. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have alternate text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Costco.ca may provide assistance to deaf or hearing-impaired users with captions on videos.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements
Review Preferences

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
0

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that costco.ca should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.

Audits

Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
Bootstrap
3.3.6
jQuery
1.10.2
React
boomerang.js
1.720.0
core-js
core-js-pure@3.25.5; core-js-global@2.6.12
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
URL Map URL
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/url=mainjQuery.min.js.map,includeSources=true
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/cot.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/cot.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/url=all.home.min.js.map,includeSources=true
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://costco.ca/
Allowed
Includes front-end JavaScript libraries with known security vulnerabilities — 9 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Library Version Vulnerability Count Highest Severity
SHOW DETAILS
5
Medium
SHOW DETAILS
4
Medium

Audits

Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Source Description
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
TypeError: Cannot read properties of undefined (reading 'catalog') at https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/DeliveryLocation.96f22a1e.chunk.js:1:7401 at d (https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js:2:424794) at Generator._invoke (https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js:2:424547) at Generator.next (https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js:2:425157) at r (https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js:2:420379) at u (https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js:2:420582) at https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js:2:420641 at new Promise (<anonymous>) at https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js:2:420522 at https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/DeliveryLocation.96f22a1e.chunk.js:1:8576
83

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for costco.ca. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of costco.ca on mobile screens.
Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Links do not have descriptive text — 1 link found
Make use of descriptive link text to assist search engines in understanding the content.

Crawling and Indexing

Links are not crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
22

PWA

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of costco.ca. This includes details about web app manifests.

PWA Optimized

Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of costco.ca on mobile screens.

Installable

Web app manifest or service worker do not meet the installability requirements — 1 reason
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
Failure reason
No manifest was fetched

PWA Optimized

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Avg. (All Categories) 55
Performance 8
Accessibility 98
Best Practices 0
SEO 83
PWA 30
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://www.costco.ca/
Updated: 7th November, 2022

1.41 seconds
First Contentful Paint (FCP)
85%
11%
4%

0.18 seconds
First Input Delay (FID)
67%
15%
18%

Simulate loading on mobile
8

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for costco.ca. This includes details about optimizing page load times which can result in a better user experience.

Other

Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Costco.ca should consider minifying CSS files.
Minify JavaScript — Potential savings of 5 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Costco.ca should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
inline: window.adobeopt = window.adobeopt || { ...
10650
5350
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 230 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://www.costco.ca/
232.764
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Costco.ca should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.
Avoid chaining critical requests — 5 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Costco.ca should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
All text remains visible during webfont loads
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
Keep request counts low and transfer sizes small — 285 requests • 4,362 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
285
4466211
Script
98
1803875
Image
118
1610883
Other
61
784470
Document
2
150465
Stylesheet
6
116518
Media
0
0
Font
0
0
Third-party
158
2743482
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
We use strictly necessary cookies to make our Sites work. In addition, if you c…
Largest Contentful Paint image was not lazily loaded
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint.
Avoid large layout shifts — 1 element found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
Inova Car and Home Insurance. Complete your quote and buy online now!
0.10608009338379
Avoid long main-thread tasks — 20 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://media-cdn.costco.ca/app-costco.js?v=20201211
3168
1129
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
23460
1012
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
27810
1011
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LBom/KjshRhEB
24989
793
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
1472
666
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
2288
612
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
30471
465
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
12510
443
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
29132
427
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
807
280
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
2900
268
https://s.go-mpulse.net/boomerang/V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU
6033
268
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
24722
267
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
4524
264
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
25782
263
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
1097
261
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
24472
250
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
26517
246
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
31686
231
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
5806
227
Avoid non-composited animations — 4 animated elements found
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Element Name
Postal Code
Postal Code
Cookie Preferences
We use strictly necessary cookies to make our Sites work. In addition, if you c…
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of costco.ca on mobile screens.
Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Audits

Network Requests
Below is a list of network requests that were made during page load.
URL Protocol Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://costco.ca/
http/1.1
0
152.68599998672
320
0
302
text/plain
https://www.costco.ca/
h2
152.98599994276
384.76399995852
76135
500847
200
text/html
Document
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/css/rwd.app.home.min.css
h2
407.6659999555
776.44499996677
56637
291458
200
text/css
Stylesheet
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
h2
407.97299996484
744.93599997368
33514
98321
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
h2
408.2149999449
801.28799995873
71622
249588
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
h2
408.5999999661
650.02800000366
50396
206824
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
h2
408.90899999067
452.67799997237
1883
4233
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js
h2
409.22699996736
552.47399990913
2244
4688
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js
h2
409.41399999429
453.13599996734
4328
14495
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/cot.module.min.js
h2
409.74599996116
684.31399995461
1536
3299
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js
h2
410.33399989828
661.29399999045
1346
2109
200
application/x-javascript
Script
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js
h2
912.65699989162
940.16999995802
8030
21748
200
application/javascript
Script
https://www.costco.ca/wcsstore/RWDStaticAssets/js/vendor/lozad/lozad.min.js
h2
410.91699991375
594.97799992096
1574
3094
200
application/x-javascript
Script
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
h2
411.10799997114
442.87599995732
113554
429323
200
application/x-javascript
Script
https://www.costco.ca/wcsstore/RWDStaticAssets/react-variant/wiocommon.js
h2
411.49999992922
635.53199998569
1231
2941
200
application/x-javascript
Script
https://media-cdn.costco.ca/app-costco.js?v=20201211
http/1.1
411.80099989288
653.10899994802
15557
55960
200
application/javascript
Script
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco-Wholesale-Canada.svg
h2
912.85299998708
1029.7839998966
3535
7299
200
image/svg+xml
Image
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco_Canada_Logo.png
h2
913.12699997798
967.19499991741
7939
7511
200
image/png
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-lgban-221107-costco-shop-card-en.jpg
h2
913.31899992656
1081.7829999141
24578
24182
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/sm-half-ban-220704-nonmember-en.jpg
h2
913.60099997837
1028.5199999344
9460
9066
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/sm-half-ban-220704-renew-en.jpg
h2
913.8259999454
1041.6749999858
11694
11258
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190401-ITW-en.jpg
h2
913.988999906
1028.8810000056
3471
3044
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190401-TH-en.jpg
h2
914.12899992429
1088.9040000038
4634
4246
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190429-Hotbuys-en.jpg
h2
914.4559999695
1074.4679999771
3942
3554
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/22cweb1303-GG-redesign-homepageFeat-en.jpg
h2
915.71599990129
1029.1689999867
4066
3632
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-tvs-pre-black-friday-en.jpg
h2
915.87599995546
1042.0379999559
8735
8340
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-220103-appliances.jpg
h2
916.04999999981
1033.9379999787
10879
10484
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-computer.jpg
h2
916.18199995719
1125.236999942
7232
6798
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-en.gif
h2
916.25299991574
1160.2100000018
26418
26022
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-toms.jpg
h2
916.35899990797
1122.7399999043
7613
7218
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-furniture-event-en.jpg
h2
916.48399992846
1034.5059999963
6485
6050
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-membership-upgrade-en.jpg
h2
916.60499991849
1120.4409999773
9720
9286
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-grocery.jpg
h2
916.91099992022
1010.5349998921
13584
13188
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-GM-en.jpg
h2
917.14199993294
1152.1309999516
12872
12436
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221003-elevon.jpg
h2
917.33699990436
1156.7969999742
10614
10218
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221017-ks.jpg
h2
917.78099990916
1130.8829999762
14860
14464
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-nellies.jpg
h2
917.89099993184
1089.1999999294
3991
3598
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-01-en.jpg
h2
918.11499989126
1122.9899999453
2861
2466
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-02-en.jpg
h2
918.21199993137
1130.0359999295
3511
3116
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-03-en.jpg
h2
918.48199989181
1130.4590000072
3289
2854
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/espot-180917-WP-en.jpg
h2
918.6369999079
1144.8519999394
4759
4324
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-fullfeature-221001-CostcoOnline-en.jpg
h2
918.79999998491
1097.0959999831
9144
8750
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-fullfeature-221001-CostcoOnline-en.jpg
h2
918.88999997173
1018.6879999237
22340
21944
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/Costco-Grocery-E.png
h2
919.49699993711
997.1769999247
3774
3380
200
image/png
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-2day.png
h2
919.67400000431
1210.6669999193
4303
3908
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/instacart-logo-wordmark-en.png
h2
919.87599991262
1096.6839999892
16824
16428
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-sameday.png
h2
920.06299993955
1088.5729999281
4778
4384
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/1070-21-card-art.png
h2
920.19199999049
1143.4969999827
38529
38094
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/bottom-200203-KS-Logo.png
h2
920.28199997731
998.35999996867
2796
2362
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/220627-auto-renew-logo-en.png
h2
920.38999998476
1144.2219999153
2526
2132
200
image/webp
Image
https://www.costco.ca/wcsstore/CostcoCABCCatalogAssetStore/homepage/bottom-190429-APP.jpg
h2
920.49799999222
1052.3839999223
1643
1176
200
image/webp
Image
https://mobilecontent.costco.com/live/resource/img/ca-homepage/211206-connection-logo-en.jpg
h2
920.67399993539
1144.5659999736
1726
1292
200
image/webp
Image
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-facebook.svg
h2
920.81099993084
1052.0209999522
907
673
200
image/svg+xml
Image
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-instagram.svg
h2
921.39299993869
999.86599991098
1856
3537
200
image/svg+xml
Image
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
h2
921.51299992111
1165.675999946
120449
441278
200
application/x-javascript
Script
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
h2
779.01099994779
930.03299995326
71914
186624
200
application/javascript
Script
https://dpm.demdex.net/id?d_visid_ver=5.2.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_orgid=97B21CFE5329614E0A490D45%40AdobeOrg&d_nsid=0&ts=1667856093161
http/1.1
857.52099996898
1157.2529999539
1117
365
200
application/json
XHR
https://assets.adobedtm.com/extensions/EPb56e12d7054b4acea984e91c910051cc/AppMeasurement.min.js
h2
921.66499991436
949.8939999612
12675
33522
200
application/x-javascript
Script
https://assets.adobedtm.com/extensions/EPb56e12d7054b4acea984e91c910051cc/AppMeasurement_Module_ActivityMap.min.js
h2
921.78299999796
1001.5129999956
2049
3303
200
application/x-javascript
Script
https://s.go-mpulse.net/boomerang/V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU
h2
911.85899998527
1009.9829999963
50666
209939
200
application/javascript
Script
https://www.costco.ca/MessagesJS?langId=-24&storeId=10302&isPharmacy=false&getJsonValue=true
h2
922.24999994505
1017.877999926
21130
75252
200
application/json
XHR
https://www.costco.ca/CountryJS?langId=-24&storeId=10302
h2
926.33499996737
1085.8499999158
1536
5065
200
application/json
XHR
https://media-cdn.costco.ca/www3/;ID=182839;setID=530932;type=jsonr;domid=media-cdn-set-01;kw=EN;referrer=https%3A%2F%2Fwww.costco.ca%2F;click=CLICK_MACRO_PLACEHOLDER
http/1.1
944.73599991761
1145.8969999803
1453
2562
200
application/json
XHR
https://media-cdn.costco.ca/www3/;ID=182839;setID=530933;type=jsonr;domid=media-cdn-set-02;kw=EN;referrer=https%3A%2F%2Fwww.costco.ca%2F;click=CLICK_MACRO_PLACEHOLDER
http/1.1
945.29599999078
1029.4569999678
1640
4543
200
application/json
XHR
https://media-cdn.costco.ca/www3/;ID=182839;setID=530934;type=jsonr;domid=media-cdn-set-03;kw=EN;referrer=https%3A%2F%2Fwww.costco.ca%2F;click=CLICK_MACRO_PLACEHOLDER
http/1.1
948.2330000028
1082.4809999904
555
35
200
application/json
XHR
data
1020.3209999017
1048.7019999418
24284
24284
200
application/font-woff
Font
https://media-cdn.costco.ca/www3/;MID=182839;type=e57e9bfc3;placementID=1939698;setID=530933;channelID=0;CID=711705;BID=520836135;TAID=0;place=0;ip=67.205.137.127;matches=%5B%22EN%22%5D;referrer=https%3A%2F%2Fwww.costco.ca%2F;mt=1667856093320858;hc=62fc10a192281821dbc96b821d29db543ee8767f
http/1.1
1107.5929999352
1359.0319999494
529
0
200
text/html
XHR
https://media-cdn.costco.ca/www3/;MID=182839;type=e57e9bfc3;placementID=1939705;setID=530933;channelID=0;CID=711707;BID=520836138;TAID=0;place=0;ip=67.205.137.127;matches=%5B%22EN%22%5D;referrer=https%3A%2F%2Fwww.costco.ca%2F;mt=1667856093320958;hc=9eec17b1cabb14b547f119e10ca81fa17db2c826
http/1.1
1109.3489999184
1198.2899999712
529
0
200
text/html
XHR
https://media-cdn.costco.ca/www3-media/?libBID=3659721
http/1.1
1109.9849999882
1425.7429999998
27618
27218
200
image/webp
Image
https://media-cdn.costco.ca/www3/;ID=182839;size=1x1;type=p57e9bfc3;setID=530933;plid=1939698;BID=520836135;place=0;wt=1667859693;rnd=85321;v=0;ip=67.205.137.127;matches=%5B%22EN%22%5D
http/1.1
1110.1079999935
1279.5530000003
508
43
200
image/gif
Image
https://media-cdn.costco.ca/www3-media/?libBID=3661145
http/1.1
1110.3329999605
1219.4969999837
32312
31912
200
image/webp
Image
https://media-cdn.costco.ca/www3/;ID=182839;size=1x1;type=p57e9bfc3;setID=530933;plid=1939705;BID=520836138;place=0;wt=1667859693;rnd=18838;v=0;ip=67.205.137.127;matches=%5B%22EN%22%5D
http/1.1
1110.6969999382
1266.6609999724
508
43
200
image/gif
Image
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
h2
1326.8819999648
1656.6979999188
1185
18
201
application/json
XHR
https://smetrics.costco.ca/id?d_visid_ver=5.2.0&d_fieldgroup=A&mcorgid=97B21CFE5329614E0A490D45%40AdobeOrg&mid=59145914285567022900188045582457984731&ts=1667856093644
h2
1339.4189999672
1426.2439999729
692
48
200
application/x-javascript
XHR
https://costco.tt.omtrdc.net/rest/v1/delivery?client=costco&sessionId=f42bc819bf914b3f8d0090d446d7a798&version=2.4.0
h2
1349.1279999726
1436.1860000063
17854
98583
200
application/json
XHR
https://cdn.cookielaw.org/consent/4325a455-ccf4-4ed6-854d-e9f4af4f7c2b/4325a455-ccf4-4ed6-854d-e9f4af4f7c2b.json
h2
1392.4579999875
1424.4969999418
2285
3105
200
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https://media-cdn.costco.ca/www3/;MID=182839;type=e57e9bfc3;placementID=1939705;setID=530933;channelID=0;CID=711707;BID=520836138;TAID=0;place=0;ip=67.205.137.127;matches=%5B%22EN%22%5D;referrer=https%3A%2F%2Fwww.costco.ca%2F;mt=1667856097116677;hc=4d4443ca5dee8d0299e019f409f627791dbfc2f7
http/1.1
6161.543999915
6324.7160000028
529
0
200
text/html
XHR
https://media-cdn.costco.ca/www3/;ID=182839;size=1x1;type=p57e9bfc3;setID=530933;plid=1939698;BID=520836135;place=0;wt=1667859697;rnd=75658;v=0;ip=67.205.137.127;matches=%5B%22EN%22%5D
http/1.1
6162.1889999369
6236.8680000072
508
43
200
image/gif
Image
https://media-cdn.costco.ca/www3/;ID=182839;size=1x1;type=p57e9bfc3;setID=530933;plid=1939705;BID=520836138;place=0;wt=1667859697;rnd=20205;v=0;ip=67.205.137.127;matches=%5B%22EN%22%5D
http/1.1
6162.7469999949
6243.2029999327
508
43
200
image/gif
Image
https://c.go-mpulse.net/api/config.json?key=V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU&d=www.costco.ca&t=5559520&v=1.720.0&if=&sl=1&si=8212bc6b-885b-40a9-b073-75f15970134d-rkzxzw&bcn=%2F%2F173bf104.akstat.io%2F&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,Early,EventTiming,LOGN&acao=&ak.ai=192048
http/1.1
6281.5849999897
6408.7569999974
1069
1565
200
application/json
XHR
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
h2
6525.8629999589
6561.3549998961
87994
368186
200
application/javascript
Script
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC5f9e58d6560a4c28aeee4b736e390112-source.min.js
h2
6549.1889999248
6624.4769999757
979
1210
200
application/x-javascript
Script
https://cdn.cookielaw.org/consent/4325a455-ccf4-4ed6-854d-e9f4af4f7c2b/e65aac73-3555-496f-b4cf-fba64f453fc9/en.json
h2
7115.7009999733
7147.5829998963
31769
174872
200
application/x-javascript
Fetch
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC8ac508830e5240ee98f97b65f1eb62f3-source.min.js
h2
7144.639999955
7221.7269999674
1009
1034
200
application/x-javascript
Script
https://geocodeservice.costco.com/Locations?q=M4H%201B6&country=CAN
http/1.1
7155.8939999668
7247.6479999023
748
302
200
application/json
XHR
https://geocodeservice.costco.com/Locations?q=M4H%201B6&country=CAN
http/1.1
7169.047000003
7512.0189998997
748
302
200
application/json
XHR
https://cdn.cookielaw.org/scripttemplates/6.35.0/assets/otFlat.json
h2
7196.3449999457
7232.9149999423
3831
12867
200
application/json
Fetch
https://cdn.cookielaw.org/scripttemplates/6.35.0/assets/v2/otPcTab.json
h2
7197.0860000001
7223.4579999931
14603
61609
200
application/json
Fetch
https://cdn.cookielaw.org/scripttemplates/6.35.0/assets/otCommonStyles.css
h2
7197.8669998934
7222.6929999888
5076
21866
200
text/css
Fetch
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC4251817aa6334f55882abe6b3ec6881b-source.min.js
h2
7226.9489999162
7361.4469999447
1498
2986
200
application/x-javascript
Script
https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg
h2
7279.7509999946
7280.0259999931
2322
2998
200
image/svg+xml
Image
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RC652838c14af0493a9c118be06eb67e49-source.min.js
h2
7405.5859999498
7481.5899999812
17408
68905
200
application/x-javascript
Script
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.707&longitude=-79.345&limit=50&openingDate=2022-11-07
http/1.1
7416.5579999099
7521.4369999012
139455
138446
200
application/json
XHR
https://173bf104.akstat.io/
7638.9569999883
7645.2099999879
0
0
-1
Ping
https://media-cdn.costco.ca/www3/;MID=182839;type=v57e9bfc3;placementID=1939684;setID=530932;channelID=0;CID=711700;BID=520836123;TAID=0;place=0;ip=67.205.137.127;matches=%5B%22EN%22%5D;referrer=https%3A%2F%2Fwww.costco.ca%2F;mt=1667856097075342;hc=891149d905df9e8e7adc420d4502bb0029fe7463
http/1.1
7866.8060000055
7960.9990000026
529
0
200
text/html
XHR
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
-3456.202
29.517
-3069.158
13.851
-3054.334
140.143
-2907.127
6.673
-2898.238
65.243
-2828.432
13.448
-2773.645
12.95
-2757.32
8.76
-2745.804
9.748
-2729.141
5.818
-2703.522
17.577
-2685.613
166.536
-2514.752
17.434
-2491.645
37.455
-2452.185
6.422
-2439.999
305.782
-2134.099
8.429
-2118.895
5.271
-2113.604
67.038
-2045.16
564.263
-1480.798
29.114
-1444.079
5.357
-1424.661
221.421
-1203.136
28.619
-1173.779
6.786
-1164.57
66.888
-1081.581
13.379
-1030.647
66.006
-964.574
33.496
-928.909
10.207
-918.497
66.886
-851.59
102.233
-746.093
5.774
-729.437
13.652
-680.28
27.229
-618.516
14.468
-601.841
112.7
-489.1
11.877
-463.187
5.278
-380.624
21.615
-277.421
29.023
-243.995
56.852
-182.547
5.939
-153.496
24.125
-56.364
57.026
250.586
11.111
261.764
13.967
287.705
9.746
302.993
34.407
337.561
7.413
371.004
8.236
382.887
5.893
551.207
38.26
644.182
10.965
656.229
124.843
788.635
66.861
858.537
5.702
876.753
5.787
891.312
13.518
906.953
8.504
916.105
5.684
922.098
7.899
944.125
11.692
955.981
198.202
1154.68
65.66
1222.606
505.719
1728.431
8.839
1737.284
5.318
1743.701
20.277
1771.2
506.049
2277.385
30.117
2308.374
7.576
2319.279
75.6
2407.504
22.734
2434.45
85.03
2532.908
106.72
2642.551
21.156
2663.724
9.556
2679.236
7.231
2697.295
5.291
2729.084
46.574
2775.807
44.551
2822.543
232.697
3055.322
12.858
3070.347
5.819
3077.869
122.858
3200.813
32.634
3234.387
22.621
3257.118
11.926
3271.546
20.64
3299.452
5.725
3313.09
5.342
3322.435
28.986
3387.81
115.379
3503.245
6.07
3513.953
12.052
3531.224
13.783
3545.494
5.672
3551.496
7.655
3559.367
5.827
3572.852
6.212
3589.65
5.366
3622.909
5.41
3639.158
38.309
3682.481
55.241
3739.825
9.242
3766.433
26.707
3803.368
6
3815.38
7.177
4040.156
5.417
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Other

Enable text compression — Potential savings of 127 KiB
Text-based resources should be served with compression, such as gzip, deflate or brotli.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.707&longitude=-79.345&limit=50&openingDate=2022-11-07
138446
130201
Avoid serving legacy JavaScript to modern browsers — Potential savings of 21 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
7737
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/5587.e6b06404.chunk.js
6773
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
6536
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4950.d33cd039.chunk.js
83
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
56
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
53
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6189.49aa4085.chunk.js
45

Metrics

First Contentful Paint — 7.6 s
The time taken for the first image or text on the page to be rendered.
Time to Interactive — 29.0 s
The time taken for the page to become fully interactive.
Speed Index — 15.4 s
The time taken for the page contents to be visibly populated.
Total Blocking Time — 3,750 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).
Largest Contentful Paint — 27.6 s
The timing of the largest text or image that is painted.
Cumulative Layout Shift — 0.257
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Audits

Max Potential First Input Delay — 1,010 ms
Users could experience a delay when interacting with the page.
First Meaningful Paint — 10.1 s
The time taken for the primary content of the page to be rendered.

Other

Eliminate render-blocking resources — Potential savings of 900 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Costco.ca should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/css/rwd.app.home.min.css
56637
750
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
113554
1350
Properly size images — Potential savings of 105 KiB
Images can slow down the page's load time. Costco.ca should consider serving more appropriate-sized images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/1070-21-card-art.png
38094
34932
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-hero-221107-furniture-en.jpg
59928
19439
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-hero-221107-sony-tv-en.jpg
46564
15104
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/instacart-logo-wordmark-en.png
16428
14255
https://media-cdn.costco.ca/www3-media/?libBID=3561909
27460
8897
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-lgban-221107-costco-shop-card-en.jpg
24182
7835
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-fullfeature-221001-CostcoOnline-en.jpg
21944
7059
Defer offscreen images — Potential savings of 255 KiB
Time to Interactive can be slowed down by resources on the page. Costco.ca should consider lazy-loading offscreen and hidden images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://mobilecontent.costco.com/live/resource/img/static-us-landing-pages/instacart-logo-faq-20w09139.svg
49556
49556
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/1070-21-card-art.png
38094
38094
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/211201-gourmet-food-espot-en.jpg
26110
26110
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-fullfeature-221001-CostcoOnline-en.jpg
21944
21944
https://media-cdn.costco.ca/www3-media/?libBID=3561907
20954
20954
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/instacart-logo-wordmark-en.png
16428
16428
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221017-ks.jpg
14464
14464
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-GM-en.jpg
12436
12436
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221003-elevon.jpg
10218
10218
https://mobilecontent.costco.com/live/resource/img/ca-homepage/d-fullfeature-221001-CostcoOnline-en.jpg
8750
8750
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco_Canada_Logo.png
7511
7511
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-sameday.png
4384
4384
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/espot-180917-WP-en.jpg
4324
4324
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-2day.png
3908
3908
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-nellies.jpg
3598
3598
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/Costco-Grocery-E.png
3380
3380
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-02-en.jpg
3116
3116
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-03-en.jpg
2854
2854
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-01-en.jpg
2466
2466
https://mobilecontent.costco.com/live/resource/img/ca-homepage/bottom-200203-KS-Logo.png
2362
2362
https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg
2322
2322
https://mobilecontent.costco.com/live/resource/img/ca-homepage/220627-auto-renew-logo-en.png
2132
2132
Reduce unused CSS — Potential savings of 68 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Costco.ca should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/css/rwd.app.home.min.css
56637
51336
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} ...
21125
18767
Reduce unused JavaScript — Potential savings of 190 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
87994
45443
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
50396
38209
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
71622
33060
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
120449
28816
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
113554
25922
https://s.go-mpulse.net/boomerang/V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU
50666
22646
Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Serve images in next-gen formats
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
Avoid multiple page redirects — Potential savings of 18,660 ms
Redirects can cause additional delays before the page can begin loading. Costco.ca should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://costco.ca/
18660
https://www.costco.ca/
0
https://www.costco.ca/
0
Avoid enormous network payloads — Total size was 4,362 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.681&longitude=-79.399&limit=50&openingDate=2022-11-07
140336
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.681&longitude=-79.399&limit=50&openingDate=2022-11-07
140328
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.681&longitude=-79.399&limit=50&openingDate=2022-11-07
140297
https://api.costco.com/warehouseLocatorMobile/v1/warehouses.json?client_id=45823696-9189-482d-89c3-0c067e477ea1&latitude=43.707&longitude=-79.345&limit=50&openingDate=2022-11-07
139455
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
120449
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
120449
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
113554
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
113554
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
87994
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
87994
Serve static assets with an efficient cache policy — 109 resources found
Costco.ca can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://mobilecontent.costco.com/live/resource/img/static-us-landing-pages/instacart-logo-faq-20w09139.svg
0
49880
https://mobilecontent.costco.com/live/resource/img/static-us-landing-pages/instacart-logo-faq-20w09139.svg
0
49880
https://media-cdn.costco.ca/app-costco.js?v=20201211
1800000
15557
https://media-cdn.costco.ca/app-costco.js?v=20201211
1800000
15557
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
3600000
120449
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
3600000
120449
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
3600000
113554
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
3600000
113554
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
3600000
71622
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
3600000
71622
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
3600000
50396
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
3600000
50396
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
3600000
37925
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
3600000
37925
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RCaae2a996f45041258abe5c372be50544-source.min.js
3600000
34623
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RCaae2a996f45041258abe5c372be50544-source.min.js
3600000
34623
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3600000
33514
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6189.49aa4085.chunk.js
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6189.49aa4085.chunk.js
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4950.d33cd039.chunk.js
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4950.d33cd039.chunk.js
3600000
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4862.65a6adf4.chunk.js
3600000
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3600000
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1871.441d21a4.chunk.js
3600000
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/WarehouseSidebar.bbc27ae0.chunk.js
3600000
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/WarehouseSidebar.bbc27ae0.chunk.js
3600000
6226
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/DeliveryLocation.96f22a1e.chunk.js
3600000
6160
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/DeliveryLocation.96f22a1e.chunk.js
3600000
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3600000
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3600000
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3600000
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3600000
5769
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3600000
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6456.0c12a5c6.chunk.js
3600000
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3600000
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3600000
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3600000
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3600000
4947
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4577.d88dc697.chunk.js
3600000
4864
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/4577.d88dc697.chunk.js
3600000
4864
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js
3600000
4328
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js
3600000
4328
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1378.ece826b9.chunk.js
3600000
4269
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3600000
4268
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/8418.dfa8f6ec.chunk.js
3600000
3858
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/8418.dfa8f6ec.chunk.js
3600000
3857
https://www.costco.ca/wcsstore/CostcoGLOBALSAS/images/Costco-Wholesale-Canada.svg
3600000
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3600000
3535
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/AccountMenu.087d1543.chunk.js
3600000
3365
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/AccountMenu.087d1543.chunk.js
3600000
3365
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/7064.945f3fa1.chunk.js
3600000
3267
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/7064.945f3fa1.chunk.js
3600000
3267
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6259.2fe32f01.chunk.js
3600000
2846
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3600000
2846
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/5946.3ee71060.chunk.js
3600000
2573
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/5946.3ee71060.chunk.js
3600000
2573
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1535.34d53d64.chunk.js
3600000
2536
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1535.34d53d64.chunk.js
3600000
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/1251.1ba72a5a.chunk.js
3600000
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3600000
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3600000
2244
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js
3600000
2244
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
3600000
1883
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
3600000
1883
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-instagram.svg
3600000
1856
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-instagram.svg
3600000
1856
https://www.costco.ca/wcsstore/RWDStaticAssets/js/vendor/lozad/lozad.min.js
3600000
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https://www.costco.ca/wcsstore/RWDStaticAssets/js/vendor/lozad/lozad.min.js
3600000
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3600000
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3600000
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3600000
1346
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js
3600000
1346
https://www.costco.ca/wcsstore/RWDStaticAssets/react-variant/wiocommon.js
3600000
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https://www.costco.ca/wcsstore/RWDStaticAssets/react-variant/wiocommon.js
3600000
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3600000
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3600000
725
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
14400000
87994
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
14400000
87994
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js
14400000
8030
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js
14400000
8030
https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg
14400000
2322
https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg
14400000
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86400000
56637
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86400000
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86400000
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https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/css/DeliveryLocation.cecd78b0.chunk.css
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86400000
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Avoid an excessive DOM size — 5,391 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
5391
Maximum DOM Depth
div.col-xs-6 > div.style-check > label > i.wl-gas-station
21
Maximum Child Elements
Appliance Parts & Accessories Commercial F…
1123
Reduce JavaScript execution time — 14.8 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
4276.844
1886.736
2.236
https://www.costco.ca/
3326.832
466.228
45.008
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
2792.98
1652.076
77.344
https://assets.adobedtm.com/6d09a901247b3615ff6f4d9f22bda8ea810f369e/satelliteLib-5fef5b4a6450b6581f6444686d6f174427a7a108.js
2744.32
1846.216
297.984
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/main.39068954.js
2525.516
2089.072
124.884
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LSE7/TV42TRIB
1860.268
1307.108
18.464
https://s.go-mpulse.net/boomerang/V2XR2-2WQLH-RZ9ZE-X2DZR-3UAEU
1541.368
444.216
27.268
https://www.costco.ca/IDq3/4Wp3/JvDJ/lH2Q/9Q/DEz1VLctaO/Y3R7TH0B/LBom/KjshRhEB
1523.024
1380.832
16.32
Unattributable
1343.024
242.5
0
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/221.03949279.chunk.js
1310.616
1202.856
23.932
https://cdn.cookielaw.org/scripttemplates/6.35.0/otBannerSdk.js
1016.2
665.768
67.112
https://www.costco.ca/wcsstore/RWDStaticAssets/react/static/js/6189.49aa4085.chunk.js
311.36
295.436
14.756
https://media-cdn.costco.ca/app-costco.js?v=20201211
278.468
156.068
9.936
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
232.032
147.992
39.212
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
131.148
81.268
49.284
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js
102.22
84.3
5.736
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/css/rwd.app.home.min.css
99.264
0
0
https://assets.adobedtm.com/db2abc551d12/237ca126a76b/3638c857530d/RCaae2a996f45041258abe5c372be50544-source.min.js
81.476
55.116
24.208
Minimize main-thread work — 25.9 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
14210.168
Style & Layout
4801.78
Other
2766.816
Rendering
1272.656
Garbage Collection
993.332
Script Parsing & Compilation
985.688
Parse HTML & CSS
871.504
Reduce the impact of third-party code — Third-party code blocked the main thread for 1,780 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
370138
1266.448
SHOW DETAILS
312750
322.564
SHOW DETAILS
103531
194.728
SHOW DETAILS
35710
0
SHOW DETAILS
601
0
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Source
SHOW DETAILS
SHOW DETAILS
Avoid `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Source
SHOW DETAILS
Image elements do not have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.
URL
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/1070-21-card-art.png
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-hero-221107-sony-tv-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-hero-221107-furniture-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-hero-221107-mattress-en.jpg
https://media-cdn.costco.ca/www3-media/?libBID=3561909
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-fullfeature-221001-CostcoOnline-en.jpg
https://media-cdn.costco.ca/www3-media/?libBID=3659721
https://media-cdn.costco.ca/www3-media/?libBID=3661145
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/instacart-logo-wordmark-en.png
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-01-en.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-02-en.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/staple-row-210217-03-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190401-TH-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/22cweb1303-GG-redesign-homepageFeat-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-tvs-pre-black-friday-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-220103-appliances.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-computer.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-en.gif
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-toms.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-furniture-event-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221031-membership-upgrade-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-grocery.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-GM-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221003-elevon.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221017-ks.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-221107-nellies.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/espot-180917-WP-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190401-ITW-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/espot-190429-Hotbuys-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/sm-half-ban-220704-nonmember-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/sm-half-ban-220704-renew-en.jpg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/m-lgban-221107-costco-shop-card-en.jpg
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/Costco-Grocery-E.png
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-sameday.png
https://mobilecontent.costco.com/live/resource/img/static-ca-landing-pages/gocery-details-2day.png
https://www.costco.ca/wcsstore/RWDStaticAssets/fonts/fallback-icons/icons/social-facebook.svg
https://mobilecontent.costco.com/live/resource/img/ca-homepage/220627-auto-renew-logo-en.png
https://mobilecontent.costco.com/live/resource/img/ca-homepage/bottom-200203-KS-Logo.png
https://mobilecontent.costco.com/live/resource/img/ca-homepage/211206-connection-logo-en.jpg
First Contentful Paint (3G) — 15810 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.
98

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of costco.ca. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have alternate text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Costco.ca may provide assistance to deaf or hearing-impaired users with captions on videos.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements
Review Preferences

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
0

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that costco.ca should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.

Audits

Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
Bootstrap
3.3.6
jQuery
1.10.2
React
boomerang.js
1.720.0
core-js
core-js-pure@3.25.5; core-js-global@2.6.12
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
URL Map URL
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/smartbanner.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/shoppinglistshelper.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/rrvndr.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/mainjQuery.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/url=mainjQuery.min.js.map,includeSources=true
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/home.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/global.hbp.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/cot.module.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/cot.module.min.js.map
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/all.home.min.js
https://www.costco.ca/wcsstore/builds/3.0.58872.0/RWDStaticAssets/js/built/url=all.home.min.js.map,includeSources=true
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://costco.ca/
Allowed
Includes front-end JavaScript libraries with known security vulnerabilities — 9 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Library Version Vulnerability Count Highest Severity
SHOW DETAILS
5
Medium
SHOW DETAILS
4
Medium

Audits

Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Source Description
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
SHOW DETAILS
Failed to load resource: the server responded with a status of 404 (Not Found)
83

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for costco.ca. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of costco.ca on mobile screens.
Document uses legible font sizes — 99.29% legible text
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Source Selector % of Page Text Font Size
SHOW DETAILS
.slick-dots li button
0.25%
10px
SHOW DETAILS
#header-widget .account-cart.top-links .top-button-title
0.13%
10px
SHOW DETAILS
SHOW DETAILS
0.11%
10px
SHOW DETAILS
.GDDcta
0.10%
11px
SHOW DETAILS
.slick-next, .slick-prev
0.08%
0px
SHOW DETAILS
.slick-dots li.pause button
0.01%
10px
SHOW DETAILS
0.04%
< 12px
SHOW DETAILS
99.29%
≥ 12px

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Links do not have descriptive text — 1 link found
Make use of descriptive link text to assist search engines in understanding the content.

Crawling and Indexing

Links are not crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
30

PWA

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of costco.ca. This includes details about web app manifests.

PWA Optimized

Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of costco.ca on mobile screens.

Installable

Web app manifest or service worker do not meet the installability requirements — 1 reason
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
Failure reason
No manifest was fetched

PWA Optimized

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Hosting

Server Location

Server IP Address: 23.10.90.116
Continent: North America
Country: United States
United States Flag
Region: New York
City: New York
Longitude: -74.0066
Latitude: 40.7126
Currencies: USD
USN
USS
Languages: English

Web Hosting Provider

Name IP Address
Akamai Technologies, Inc.
Registration

Domain Registrant

Private Registration: No
Name:
Organization:
Country:
City:
State:
Post Code:
Email:
Phone:
Note: Registration information is derived from various sources and may be inaccurate.

Domain Registrar

Security

Visitor Safety

Mature Content: Not Likely
McAfee WebAdvisor Rating: Safe
WOT Rating:
WOT Trustworthiness: 91/100
WOT Child Safety: 90/100
Note: Safety information is not guaranteed.

SSL/TLS Certificate

Issued To: costco.ca
Issued By: DigiCert ECC Extended Validation Server CA
Valid From: 4th May, 2022
Valid To: 5th May, 2023
Subject: CN = costco.ca
O = Costco Wholesale CORPORATION
L = Issaquah
S = US
Hash: 7a66e966
Issuer: CN = DigiCert ECC Extended Validation Server CA
OU = www.digicert.com
O = DigiCert Inc
S = US
Version: 2
Serial Number: 19029612246011336098260533530908421489
Serial Number (Hex): 0E50F852473E40F6DCA28967D327ED71
Valid From: 4th May, 2024
Valid To: 5th May, 2024
Signature Algorithm (Short Name): ecdsa-with-SHA384
Signature Algorithm (Long Name): ecdsa-with-SHA384
Authority Key Identifier: keyid:F8:25:D9:A6:39:C7:C3:81:87:25:3E:30:54:91:18:21:40:9B:17:9D
Extended Key Usage: TLS Web Server Authentication, TLS Web Client Authentication
CRL Distribution Points:
Full Name:
URI:http://crl3.digicert.com/DigiCertECCExtendedValidationServerCA.crl

Full Name:
URI:http://crl4.digicert.com/DigiCertECCExtendedValidationServerCA.crl
Certificate Policies: Policy: 2.16.840.1.114412.2.1
Policy: 2.23.140.1.1
CPS: http://www.digicert.com/CPS
Authority Information Access: OCSP - URI:http://ocsp.digicert.com
CA Issuers - URI:http://cacerts.digicert.com/DigiCertECCExtendedValidationServerCA.crt
SCT List: Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : E8:3E:D0:DA:3E:F5:06:35:32:E7:57:28:BC:89:6B:C9:
03:D3:CB:D1:11:6B:EC:EB:69:E1:77:7D:6D:06:BD:6E
Timestamp : May 4 02:14:33.121 2022 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:46:02:21:00:DA:A4:27:8F:33:6B:85:9B:99:D2:4F:
CC:AE:45:A0:7B:62:55:5F:97:AE:49:37:54:38:AC:3F:
83:2B:3F:AA:EF:02:21:00:EA:47:B2:3A:A5:96:06:F6:
DD:86:39:7D:42:39:D9:88:FD:74:F6:DB:58:B0:94:9D:
96:F0:81:6C:2D:A5:6D:66
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 35:CF:19:1B:BF:B1:6C:57:BF:0F:AD:4C:6D:42:CB:BB:
B6:27:20:26:51:EA:3F:E1:2A:EF:A8:03:C3:3B:D6:4C
Timestamp : May 4 02:14:33.159 2022 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:44:02:20:1D:38:E1:89:55:6D:90:61:8A:D7:5C:A4:
B6:E6:04:64:FB:77:CE:77:62:8A:D8:E5:02:B6:1B:ED:
50:96:3A:01:02:20:66:4B:DF:A2:46:0F:FF:A2:55:84:
64:C2:97:06:C8:6B:FD:4C:3A:A8:2B:BC:56:00:A8:8B:
BE:FC:F3:2F:A8:30
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : B3:73:77:07:E1:84:50:F8:63:86:D6:05:A9:DC:11:09:
4A:79:2D:B1:67:0C:0B:87:DC:F0:03:0E:79:36:A5:9A
Timestamp : May 4 02:14:33.186 2022 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:21:00:B6:78:10:91:A9:BA:7B:D9:96:73:7F:
90:07:48:E1:24:65:9C:79:03:4F:97:9F:F8:8F:79:76:
AC:B0:3C:38:EB:02:20:71:66:95:A5:6D:33:84:B9:36:
AD:A1:46:60:FB:0E:99:F0:FD:F7:5C:DE:00:E6:D3:83:
21:EF:E6:06:61:54:97
Key Usage: Digital Signature
Basic Constraints: CA:FALSE
Subject Alternative Name: DNS:www.costco.ca
DNS:costco.ca
Technical

DNS Lookup

A Records

Host IP Address Class TTL
costco.ca. 104.127.183.231 IN 20

NS Records

Host Nameserver Class TTL
costco.ca. a1-116.akam.net. IN 300
costco.ca. a6-64.akam.net. IN 300
costco.ca. a5-64.akam.net. IN 300
costco.ca. a14-67.akam.net. IN 300
costco.ca. a9-66.akam.net. IN 300
costco.ca. a28-66.akam.net. IN 300

MX Records

Priority Host Server Class TTL
5 costco.ca. mx0b-001f9d01.pphosted.com. IN 3600
5 costco.ca. mx0a-001f9d01.pphosted.com. IN 3600

SOA Records

Domain Name Primary NS Responsible Email TTL
costco.ca. a1-116.akam.net. hostmaster.akamai.com. 300

TXT Records

Host Value Class TTL
costco.ca. google-site-verification=9vD2d3XW2_Js54ahrD7yPUM47OzpHqTQ2GQgETZpKu8 IN 300
costco.ca. docusign=7822dcd7-57ae-4abd-b680-f926329bb93e IN 300
costco.ca. docusign=6b48b509-016b-486a-ad99-4c976f661c0d IN 300
costco.ca. v=spf1 IN 300

HTTP Response Headers

Whois Lookup

Created:
Changed:
Expires:
Status:
Nameservers:
Full Whois:
View Raw Whois

Nameservers

Related

Subdomains

Domain Subdomain
m.costco.ca
m

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