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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

25

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:46.859 source:map[column:28588 line:1 type:source-location url:https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:0.467 source:map[type:text value:[unattributed]]] map[reflowTime:17.953 source:map[column:71482 line:0 type:source-location url:https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/160-f739c59272f2fb9e.js urlProvider:network]] map[reflowTime:0.678 source:map[column:23023 line:0 type:source-location url:https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/1594-6472ebe988e4d68e.js urlProvider:network]] map[reflowTime:64.888 source:map[column:27735 line:0 type:source-location url:https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/4719-d3a6fc864e75ba13.js urlProvider:network]] map[reflowTime:3.924 source:map[column:39537 line:0 type:source-location url:https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/4719-d3a6fc864e75ba13.js urlProvider:network]]]

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: Member Only Savings
path: 0,DIV,0,MAIN,2,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,A,0,DIV,0,DIV,0,H2,0,DIV,1,IMG
selector: div.MuiBox-root > h2#image-container > div.MuiBox-root > img.MuiBox-root
snippet: <img class="MuiBox-root mui-mcfp9h" alt="Member Only Savings" loading="eager" sizes="(max-width: 768px) 320px, (max-width: 1024px) 768px, 1400px" src="https://bfasset.costco-static.com/56O3HXZ9/at/ftrpx6kc2ckwxmtx4mxwpk5p/m_2…" srcset="https://bfasset.costco-static.com/56O3HXZ9/at/ftrpx6kc2ckwxmtx4mxwpk5p/m_2…" data-testid="ImageVideo_Image_Mobile">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.
description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
value: No additional origins are good candidates for preconnecting

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
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/U447IH35/as/r74wmrkvsmvzbvfgpz5kwh/4000346087-847__1?aut...300.0 s18.8 KiB
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/U447IH35/as/xhkp8wv5nzc4bgh63csfp985/4000382875-847__1?a...300.0 s17.2 KiB
/U447IH35/as/5bjs4gnhrnst2f9b5x85g3fw/4000396252-847__1?a...300.0 s16.9 KiB
/U447IH35/as/jqq4rccrvfcfnmjqx6zkks/4000350943-847__1?aut...300.0 s16.7 KiB
/U447IH35/as/8qcr9xcssmsmtvb7j3f3t3x/4000403873-847__1?au...300.0 s15.8 KiB
/U447IH35/as/547prhxb4v3kvcgshqkhk7sn/4000373324-847__1?a...300.0 s14.1 KiB
/U447IH35/as/q3gsbq92hrtfbvkwc94994s/4000417255-847_tan_1...300.0 s13.2 KiB
/U447IH35/as/njgfvs7fjktxr8hqbhrpr55/4000344604-847__1?au...300.0 s13.1 KiB
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/U447IH35/as/28cspsmcxpgp45vf4mgk4krc/4000307635-847__1?a...300.0 s12.6 KiB
/U447IH35/as/q97zh43qm8frgqjghw473/4000363783-847__1?auto...300.0 s11.5 KiB
/U447IH35/as/vx7wg5f98x2hq49wfnwnkbw/4000336038-847__1?au...300.0 s11.2 KiB
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/U447IH35/as/rxk5bsqvp4gnfk85pffwv7/1794498-847__1?auto=w...300.0 s6.1 KiB
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/U447IH35/as/fs9xkf64rg8sj5mrxgf9kt/9900099-847__1?auto=w...300.0 s4.2 KiB
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cdn.intake-lr.com/logger-1.min.js14400.0 s0 B
assets.adobedtm.com/db2abc551d12/237ca126a76b/launch-01eecb8ff534.min.js3600.0 s0 B
/njwEDz-I/7MV/08B/8nNsIcmANz/4k3Emk7wuN/T3YxVxsD/cWVFF0/E...21600.0 s0 B
cdn.cookielaw.org/scripttemplates/202401.2.0/otBannerSdk.js86400.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
s.go-mpulse.net/boomerang/3C8QM-XUE3B-96T5C-HYEN8-AAN34604800.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
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bfasset.costco-static.com/fonts/CostcoSans-Upright.woff22419200.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/css/7...2419200.0 s0 B
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/56O3HXZ9/at/tvbbp3v8qr5p29bsbrxvtn5w/m_26w07474_hero_apr...300.0 s0 B
www.costco.com/nextGBrowseAssets/opinionlab_us.min.js2419200.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
dynamic.criteo.com/js/ld/ld.js?a=4826610800.0 s0 B
www.costco.com/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3E/JSUEVxsD/BThtQE/QOWiEq86400.0 s0 B
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cdn.cookielaw.org/scripttemplates/otSDKStub.js86400.0 s0 B
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static.queue-it.net/script/queueconfigloader.min.js7200.0 s0 B
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/db2abc551d12/237ca126a76b/0e64b5ebd700/RCfbe6e120fb74462...3600.0 s0 B
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/56O3HXZ9/at/8gftk38p4hxkg84v4nkph4kk/transparent_banner_...300.0 s0 B

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Thomasville Barston 4-piece Outdoor Patio Seating with Kick-out Foot Rests div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/9xgmqv4n7gkv8v6b68bj3j3z/4000283327-847__1?a...32.0 KiB15.3 KiB
Gorilla Skyline Lookout Outdoor Swing Set -Professionally Installed div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/9bxjc77rzfmjckhvgpjns4g/4000349880-847__1?au...22.2 KiB5.5 KiB

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 27.3 s
URLTime Spent
costco.com/751 ms
www.costco.com/26.6 s
www.costco.com/0.0 ms

Diagnostics

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 5.3 s 1.2 MiB
URLTransfer SizeEst Savings
d.criteo.com/Delivery/ClientPaths/Library/rm.js?a=48266&763354519178.4 KiB136.8 KiB
d.criteo.com/Delivery/ClientPaths/Library/rm.js?a=48266&763354519178.4 KiB136.8 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...73.8 KiB62.4 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...73.8 KiB61.8 KiB
cdn.cookielaw.org/scripttemplates/202401.2.0/otBannerSdk.js104.3 KiB58.2 KiB
cdn.cookielaw.org/scripttemplates/202401.2.0/otBannerSdk.js104.3 KiB58.0 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...64.2 KiB53.8 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...64.2 KiB53.8 KiB
transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/ui.js98.3 KiB45.3 KiB
transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/ui.js98.3 KiB45.3 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...56.0 KiB44.6 KiB
/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3Emk7wuNcahGiw/B0cnVxsD/G0...185.8 KiB39.9 KiB
/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3Emk7wuNcahGiw/B0cnVxsD/G0...182.0 KiB39.7 KiB
/njwEDz-I/7MV/08B/8nNsIcmANz/4k3Emk7wuN/T3YxVxsD/cWVFF0/E...154.2 KiB37.8 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...40.6 KiB36.1 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...40.6 KiB35.4 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...48.3 KiB34.6 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...48.3 KiB33.3 KiB
/njwEDz-I/7MV/08B/8nNsIcmANz/4k3Emk7wuN/T3YxVxsD/cWVFF0/E...154.2 KiB31.7 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...56.0 KiB31.2 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...46.0 KiB29.7 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...46.0 KiB29.3 KiB
cdn.intake-lr.com/logger-1.min.js123.4 KiB25.6 KiB
s.go-mpulse.net/boomerang/3C8QM-XUE3B-96T5C-HYEN8-AAN3459.3 KiB23.5 KiB
cdn.intake-lr.com/logger-1.min.js123.4 KiB23.4 KiB
s.go-mpulse.net/boomerang/3C8QM-XUE3B-96T5C-HYEN8-AAN3459.3 KiB23.1 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...40.2 KiB21.2 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...40.2 KiB21.0 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...13.7 s12.4 s43 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...6.6 s5.2 s50 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...6.1 s5.1 s67 ms
www.costco.com/5.9 s659 ms1.2 s
Unattributable2.8 s600 ms0.0 ms
transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/airgap.js2.0 s1.7 s110 ms
/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3Emk7wuNcahGiw/B0cnVxsD/G0...1.3 s1.0 s138 ms
/njwEDz-I/7MV/08B/8nNsIcmANz/4k3Emk7wuN/T3YxVxsD/cWVFF0/E...1.0 s819 ms198 ms
cdn.cookielaw.org/scripttemplates/202401.2.0/otBannerSdk.js929 ms631 ms144 ms
cdn.intake-lr.com/logger-1.min.js813 ms575 ms227 ms
d.criteo.com/Delivery/ClientPaths/Library/rm.js?a=48266&763354519805 ms497 ms280 ms
assets.adobedtm.com/db2abc551d12/237ca126a76b/launch-01eecb8ff534.min.js785 ms517 ms227 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...708 ms702 ms4.4 ms
transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/ui.js567 ms377 ms142 ms
s.go-mpulse.net/boomerang/3C8QM-XUE3B-96T5C-HYEN8-AAN34488 ms122 ms77 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...459 ms416 ms42 ms
dynamic.criteo.com/js/ld/ld.js?a=48266326 ms304 ms17 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...311 ms271 ms14 ms
cdn.cookielaw.org/scripttemplates/otSDKStub.js266 ms233 ms18 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...221 ms143 ms24 ms
www.costco.com/nextGBrowseAssets/opinionlab_us.min.js205 ms170 ms21 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...188 ms99 ms88 ms
www.costco.com/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3E/JSUEVxsD/BThtQE/QOWiEq164 ms131 ms33 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...160 ms157 ms1.5 ms
www.costco.com/akam/13/763adafd138 ms122 ms4.9 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...112 ms109 ms1.8 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...85 ms1.5 ms83 ms
/db2abc551d12/237ca126a76b/0e64b5ebd700/RCfbe6e120fb74462...81 ms77 ms0.8 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...64 ms2.1 ms61 ms
/db2abc551d12/237ca126a76b/0e64b5ebd700/RC35c2e93d6d944e4...57 ms52 ms1.2 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...57 ms3.4 ms52 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...55 ms1.7 ms53 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation33.8 s
Other4.8 s
Script Parsing & Compilation4.0 s
Style & Layout2.2 s
Parse HTML & CSS1.8 s
Garbage Collection1.1 s
Rendering1.0 s

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.Not actionable

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Michelin. Installation package is included. Micheline defender2 tire. $80 OFF … div.MuiBox-root > div#image-container > div.MuiBox-root > img.MuiBox-root
/56O3HXZ9/at/tvbbp3v8qr5p29bsbrxvtn5w/m_26w07474_hero_apr...
Some things are better in bulk. Vet bills aren't one of them. div.MuiBox-root > div#image-container > div.MuiBox-root > img.MuiBox-root
/56O3HXZ9/at/kj4vrgw9pj373bpn74srcjz/m_26w08315_homepage_...
airpods max 2 listening remastered div.MuiBox-root > div#image-container > div.MuiBox-root > img.MuiBox-root
/56O3HXZ9/at/rjp9786hhh2p4pf3jgt3bm3/m_26w08173_cat_hero_...
Costco Travel Alaska cruises div.MuiBox-root > div#image-container > div.MuiBox-root > img.MuiBox-root
/live/resource/img/Mobility2/20260413_Alaska_Cruises_Hero...
citi card div.offer-benefits > div.benefits-col-card > div.benefit-card > img.img-responsive
cdn.bfldr.com/56O3HXZ9/at/q7j547vnmw4pjt2q2x6jr83f/25w02042_citi_card.png
Sereen 6-piece Fabric Modular Sectional, Taupe div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/sjvk98mb6vxs69j6gw7xr8b9/4000366402-847__1?a...
Henredon Murphy Fabric 6-piece Modular Sectional with Ottoman, Beige div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/5bjs4gnhrnst2f9b5x85g3fw/4000396252-847__1?a...
HP OMEN 16 Slim Gaming Laptop - Intel Core Ultra 9 285H - GeForce RTX 5070 - 16… div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/547prhxb4v3kvcgshqkhk7sn/4000373324-847__1?a...
Huggies Plus Diapers Sizes 3 - 7 div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/jqq4rccrvfcfnmjqx6zkks/4000350943-847__1?aut...
Agio Nicolet 4-piece Outdoor Patio Seating Set div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/8qcr9xcssmsmtvb7j3f3t3x/4000403873-847__1?au...
Dyson Cyclone V10 Animal + Cordless Vacuum Cleaner div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/fs9xkf64rg8sj5mrxgf9kt/9900099-847__1?auto=w...
Orgain, Micronized Creatine Monohydrate, Unflavored, 1.48lbs div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/44szrws8g56mm5stcvw9379q/4000373637-847__1?a...
Greenworks 2x24V Mower, Trimmer, Blower Combo Kit with (4) 4ah Batteries div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/vx7wg5f98x2hq49wfnwnkbw/4000336038-847__1?au...
SunVilla 13ft. Round 3-Tier Cantilever Umbrella div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/q3gsbq92hrtfbvkwc94994s/4000417255-847_tan_1...
Bounty Advanced Paper Towels, 2-Ply, 103 Sheets, 12-count div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/r74wmrkvsmvzbvfgpz5kwh/4000346087-847__1?aut...
Sealy Posturepedic Pro Highland Manor 13" Medium Mattress div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/n6qp8f4p7wr6fspktmt4m2v/4000363508-847__1?au...
Lifetime Resin Outdoor 8' x 12.5' Storage Shed div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/at/77xn99pnfj7wwp4zcb3msgz/100425546-847__2.jpg...
Sorara Mirador Pergola 8.8' x 14.4' div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/28cspsmcxpgp45vf4mgk4krc/4000307635-847__1?a...
Acer Chromebook Plus 514 14” Touchscreen Laptop with Google AI – Intel Core 3 p… div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/x5rb6jnx9pc65523mmhpp8/4000359679-847__1?aut...
Carlin Fabric Power Reclining Sectional with Power Headrests div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/njgfvs7fjktxr8hqbhrpr55/4000344604-847__1?au...
Dell All-in-One 24" Desktop - Intel Core 7 150U - FHD (1920 x 1080) Touch Displ… div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/q97zh43qm8frgqjghw473/4000363783-847__1?auto...
Avocado Organic 13" Medium-Plush Pillowtop Hybrid Mattress div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/wjm5gnsvgftwxsqrxqvkkq8n/4000420285-847__1?a...
Thomasville Barston 4-piece Outdoor Patio Seating with Kick-out Foot Rests div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/9xgmqv4n7gkv8v6b68bj3j3z/4000283327-847__1?a...
Round Brilliant 0.50 ctw VS2 Clarity, G Color Diamond 14kt White Gold Solitaire… div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/rxk5bsqvp4gnfk85pffwv7/1794498-847__1?auto=w...
Shark POWERDETECT Complete Performance Upright Vacuum with Powered Lift-Away div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/vgx6b2vgxsjqmjbqcvgxf8g/4000398166-847_brown...
Veranda Classics Durham 6-piece Outdoor Patio Seating Set div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/xhkp8wv5nzc4bgh63csfp985/4000382875-847__1?a...
Gorilla Skyline Lookout Outdoor Swing Set -Professionally Installed div.MuiBox-root > div.MuiBox-root > div.MuiBox-root > img.MuiBox-root
/U447IH35/as/9bxjc77rzfmjckhvgpjns4g/4000349880-847__1?au...
Costco US homepage div.MuiBox-root > div.MuiBox-root > a.MuiTypography-root > img.MuiBox-root
/56O3HXZ9/at/wkgcrwxgt5bt39wg63kgmqr/Costco-Logo-Register...

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits
●Document request latency
●Optimize DOM size
●Font display
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Avoid long main-thread tasks 20 long tasks found
●Avoid non-composited animations 1 animated element found
●Network Requests
●Network Round Trip Times 10 ms
●Server Backend Latencies 220 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 250 ms
●Avoid large layout shifts 8 layout shifts found
○INP breakdown
○User Timing marks and measures
100

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●ARIA IDs are unique
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
77

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
SharedStorage
line 1695, col 31

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
Error caught by ErrorBoundary: Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059) undefined
Error caught by ErrorBoundary: Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059) undefined
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120538) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120614) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #418; visit https://react.dev/errors/418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at t5 (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:24673) at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:120614) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91091 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91098 at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91203) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #423; visit https://react.dev/errors/423 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:118352) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:94987 at il (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:94994) at oJ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:92350) at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91769) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Error: Minified React error #423; visit https://react.dev/errors/423 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at iZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:118352) at ia (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:95165) at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:94987 at il (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:94994) at oJ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:92350) at oZ (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/fd9d1056-bc3f2708d4ef8e0f.js:1:91769) at MessagePort.M (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.js:1:85059)
Failed to load resource: the server responded with a status of 403 ()

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

●Uses HTTPS
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
85

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Format your HTML in a way that enables crawlers to better understand your app’s content.

Crawling and Indexing

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

To appear in search results, crawlers need access to your app.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links are crawlable
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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