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Audit Complete

Results for https://costco.com

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United Stated United Stated · New York Completed: Apr 15, 2026 22:57 UTC
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Mobile 375 × 812

Screenshot of the audited page (Mobile 375×812)

Desktop 1440 × 900

Screenshot of the audited page (Desktop 1440×900)
D69

Site Health

Score: 69 / 100

Based on 8 categories, 0 sections

Room to improve — your 24.7s load time is above Google's 2.5s 'Good' threshold.

Good foundation, but a few gaps could be exploited.

Several issues make your site difficult for assistive technology users.

Solid SEO basics — a few optimizations could boost rankings.

Solid infrastructure — fast server responses across the board.

Several regulatory requirements are not yet met.

Missing metadata means poor previews on social media and search.

Heavier than average — reducing page weight saves energy and bandwidth.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Facebook sites average 72
At average
Better than 8% of Facebook sites See full Facebook benchmark →
Google Search Console sites average 73
At average
Better than 10% of Google Search Console sites See full Google Search Console benchmark →

Top Priorities (5)

1

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers
2

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy
3

Page weighs 29.1 MB (4.7 MB transferred)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget
4

2 image(s) missing alt attribute

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Alt Text Quality
5

No <main> landmark found

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Landmark Structure
View fix priority matrix

Fix Priority Matrix

5 findings

Quick Wins

2

High impact, low effort — start here.

Strategic

3

High impact, requires investment.

Easy Improvements

0

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

0

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →
BeaverCheck badge
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[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fcostco.com)](https://beavercheck.com/results/22b86054-2ffc-41c0-8930-18d1728a070a)
<a href="https://beavercheck.com/results/22b86054-2ffc-41c0-8930-18d1728a070a"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fcostco.com" alt="BeaverCheck Score"></a>
https://beavercheck.com/badge?url=https%3A%2F%2Fcostco.com

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What fixing these means

Your site has several issues that may be affecting user experience and business outcomes. Your LCP of 24.7s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your user trust.

2 security gaps detected — browsers may warn visitors about your site.
Your LCP is 24.7s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.
2 accessibility issues exclude users who rely on assistive technology.
C
Could reach Estimate based on resolving critical issues

Return on Investment

$600 investment → $1.18/month returns + USD 157,500 risk avoided

Payback period: > 2 years First-year ROI: -98%

Investment

$600

6h · 5 findings

Monthly returns

$1.18 /mo

~$14 / year

  • Bandwidth savings $1.18

Regulatory risk avoided

USD 157,500

if kept compliant

  • ADA Title III USD 150,000
  • CCPA/CPRA USD 7,500

$100 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

$600

6.0 developer hours at $100/hr

Based on United States rates ($100/hr)

Quick wins
$100 2 fixes in ~60 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions
$ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

$13,126 / month at risk

~$157,514 / year if left unfixed

Compliance Risk

$157,500

ADA Title IIICCPA/CPRA
  • No privacy policy link detected
    CCPA/CPRA: USD 2,500 – USD 7,500
  • Trackers detected but no cookie policy found
    CCPA/CPRA: USD 2,500 – USD 7,500
  • Trackers detected but no privacy policy found
    CCPA/CPRA: USD 2,500 – USD 7,500

+5 more

Bandwidth Waste

$1.18 /mo

14774.8 MB/mo × 0.080 USD/GB

  • Optimize transfer: save ~1.5 MB per page load
    Saves $1.18/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Unique monthly visitors from your analytics

Purchases, signups, or key actions

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue
Current bounce (est.)
After fixes (est.)
Estimated bounce reduction

Fix 5 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

25
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

8.39 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

24.71 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

13.34 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.070

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

11.02 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

41.56 s

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

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.

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/56O3HXZ9/at/fg2hwhxnqw5pfnn33hjkkf8/m_26w07478_third_ban...300.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
/56O3HXZ9/at/7cxxpgm3rk2zgvpk8r9cjj/26w05292_hp_icon_cost...300.0 s0 B
/56O3HXZ9/at/th59fq2s4bn3xxw9p89wv7rk/26w05292_hp_icon_me...300.0 s0 B
/56O3HXZ9/at/jwmr9s86s3vfxtbm233brzj/26w05292_hp_icon_new...300.0 s0 B
/56O3HXZ9/at/gwfv3tprss96jr4t3pmxqmf/26w05292_hp_icon_tre...300.0 s0 B
/56O3HXZ9/at/p5g7rqmhhx3jpj9jbf9h3h/d_26w07478_banner_fif...300.0 s0 B
cdn.cookielaw.org/logos/static/powered_by_logo.svg86400.0 s0 B
/56O3HXZ9/at/prrtq5sc84fjsj6vjk9wwm/m_26w07478_third_bann...300.0 s0 B
/56O3HXZ9/at/7gbgpjwmtjg6676tnvhmbvf/26w05292_hp_icon_wha...300.0 s0 B
/56O3HXZ9/at/n3trsb8vg75kvj42nmmwvwf/m_26w07478_third_ban...300.0 s0 B
/56O3HXZ9/at/h49khgbqjh48hk7nxxjtptrv/m_26w07478_banner_f...300.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
/db2abc551d12/237ca126a76b/0e64b5ebd700/RC90c96be037e14b7...3600.0 s0 B
www.costco.com/njwEDz-I/7MV/08B/8nNsIcmANz/4k3E/JSUEVxsD/RG8zCQ/F5L2RY86400.0 s0 B
/db2abc551d12/237ca126a76b/0e64b5ebd700/RC35c2e93d6d944e4...3600.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/css/5...2419200.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/css/d...2419200.0 s0 B
/db2abc551d12/237ca126a76b/0e64b5ebd700/RCfbe6e120fb74462...3600.0 s0 B
/db2abc551d12/237ca126a76b/0e64b5ebd700/RC4548e2c1c7ed4c3...3600.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
/db2abc551d12/237ca126a76b/0e64b5ebd700/RC57487e62f4cf436...3600.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...2419200.0 s0 B
/consumer-web/browse/prd/homepage-usbc/_next/static/css/e...2419200.0 s0 B
/costco/integrationconfig/javascript/queueclientConfig.js...300.0 s0 B
/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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

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`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

33
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.74 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

5.05 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

2.49 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.040

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.45 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

9.82 s

Detailed Report

Audit breakdown by category with detailed findings.

33

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

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:43.583 source:map[column:84825 line:1 type:source-location url:https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2117-c4c2e239e293cd0c.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:1.026 source:map[type:text value:[unattributed]]] map[reflowTime:20.044 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:0.766 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:20.939 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:1.834 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,0,IMG
selector: div.MuiBox-root > h2#image-container > div.MuiBox-root > img.MuiBox-root
snippet: <img class="MuiBox-root mui-13275fq" alt="Member Only Savings" loading="eager" sizes="(max-width: 768px) 320px, (max-width: 1024px) 768px, 1400px" src="https://bfasset.costco-static.com/56O3HXZ9/at/cskmj4b56br3cm6c8ptxnc8/d_26…" srcset="https://bfasset.costco-static.com/56O3HXZ9/at/cskmj4b56br3cm6c8ptxnc8/d_26…" data-testid="ImageVideo_Image">

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
/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3Emk7wuNcahGiw/B0cnVxsD/G0...21600.0 s186.9 KiB
/U447IH35/as/9xgmqv4n7gkv8v6b68bj3j3z/4000283327-847__1?a...300.0 s32.5 KiB
/U447IH35/as/9bxjc77rzfmjckhvgpjns4g/4000349880-847__1?au...300.0 s22.7 KiB
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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 KiB24.6 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 KiB14.8 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.

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: 5.5 s
URLTime Spent
costco.com/233 ms
www.costco.com/5.3 s
www.costco.com/0.0 ms

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.

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

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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Estimated savings: 790 ms 1.2 MiB
URLTransfer SizeEst Savings
d.criteo.com/Delivery/ClientPaths/Library/rm.js?a=48266&775680322178.4 KiB136.8 KiB
d.criteo.com/Delivery/ClientPaths/Library/rm.js?a=48266&775680322178.4 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.js98.2 KiB45.2 KiB
transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/ui.js98.2 KiB45.2 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...56.0 KiB44.6 KiB
/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3Emk7wuNcahGiw/B0cnVxsD/G0...184.5 KiB40.0 KiB
/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3Emk7wuNcahGiw/B0cnVxsD/G0...180.8 KiB39.1 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 KiB25.7 KiB
s.go-mpulse.net/boomerang/3C8QM-XUE3B-96T5C-HYEN8-AAN3459.3 KiB23.6 KiB
cdn.intake-lr.com/logger-1.min.js123.4 KiB23.4 KiB
s.go-mpulse.net/boomerang/3C8QM-XUE3B-96T5C-HYEN8-AAN3459.3 KiB21.4 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...40.2 KiB21.1 KiB
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...40.2 KiB21.1 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...3.5 s3.1 s11 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...1.8 s1.5 s17 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...1.8 s1.4 s14 ms
www.costco.com/1.7 s174 ms322 ms
Unattributable1.2 s187 ms0.0 ms
transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/airgap.js511 ms428 ms26 ms
/njwEDz-I/7MV/08B/8nNsIcmANz/Ef3Emk7wuNcahGiw/B0cnVxsD/G0...326 ms275 ms35 ms
/njwEDz-I/7MV/08B/8nNsIcmANz/4k3Emk7wuN/T3YxVxsD/cWVFF0/E...262 ms204 ms50 ms
cdn.cookielaw.org/scripttemplates/202401.2.0/otBannerSdk.js237 ms172 ms35 ms
cdn.intake-lr.com/logger-1.min.js230 ms157 ms56 ms
d.criteo.com/Delivery/ClientPaths/Library/rm.js?a=48266&775680322216 ms131 ms78 ms
assets.adobedtm.com/db2abc551d12/237ca126a76b/launch-01eecb8ff534.min.js199 ms125 ms61 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...190 ms188 ms1.5 ms
s.go-mpulse.net/boomerang/3C8QM-XUE3B-96T5C-HYEN8-AAN34164 ms50 ms24 ms
transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/ui.js134 ms93 ms36 ms
dynamic.criteo.com/js/ld/ld.js?a=48266128 ms119 ms4.3 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...103 ms100 ms2.2 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...102 ms59 ms3.7 ms
cdn.cookielaw.org/scripttemplates/otSDKStub.js72 ms61 ms2.4 ms
www.costco.com/nextGBrowseAssets/opinionlab_us.min.js57 ms48 ms5.1 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...52 ms33 ms6.0 ms
www.costco.com/akam/13/763adafd51 ms47 ms1.3 ms
/consumer-web/browse/prd/homepage-usbc/_next/static/chunk...51 ms43 ms8.0 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 Evaluation9.3 s
Other1.7 s
Script Parsing & Compilation1.0 s
Style & Layout633 ms
Parse HTML & CSS528 ms
Garbage Collection422 ms
Rendering294 ms

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/tbn6p7rxbpfbz2583gt6z84/d_26w07474_hero_apri...
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/6xwg7qphc3m9js8r89s6kbvm/d_26w08315_homepage...
airpods max 2 listening remastered div.MuiBox-root > div#image-container > div.MuiBox-root > img.MuiBox-root
/56O3HXZ9/at/99qfsgn568ph6gqh7gpgv5sp/d_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...
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...
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
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 20 ms
Server Backend Latencies 700 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 560 ms
Avoid large layout shifts 4 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.
`[lang]` attributes have a valid value
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.
`<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 fetching product data from Product Summary API: TypeError: Failed to fetch at a (https://transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/airgap.js:8:6643) at m (https://transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/airgap.js:8:6998) at https://transcend-cdn.com/cm/448b3320-9d7c-499a-bc56-f0dae33c8f5c/airgap.js:8:7019 at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/d320e741-f1058ad93f37c6bf.js:1:13035 at async p (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/3545-1c717d141c00f6a1.js:1:8475) at async I (https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/3545-1c717d141c00f6a1.js:1:10657) at async https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/3545-1c717d141c00f6a1.js:1:24905
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)
Shop menu:: Error fetching mega menu: Error: Failed to fetch data from https://search.costco.com/api/apps/www_costco_com/query/www_costco_com_megamenu?locale=en-US&loc=1260-3pl%2C1321-wm%2C1477-3pl%2C283-wm%2C561-wm%2C725-wm%2C731-wm%2C758-wm%2C759-wm%2C847_0-cor%2C847_0-cwt%2C847_0-edi%2C847_0-ehs%2C847_0-membership%2C847_0-mpt%2C847_0-spc%2C847_0-wm%2C847_1-cwt%2C847_1-edi%2C847_d-fis%2C847_ge_bal-edi%2C847_lg_n1a-edi%2C847_lux_us81-edi%2C847_NA-cor%2C847_NA-pharmacy%2C847_NA-wm%2C847_ss_u360-edi%2C847_wp_r428-edi%2C951-wm%2C952-wm%2C9847-wcs%2C729-bd%2C&chdmegamenu=true&userLocation=NJ&userPostal=07094: Failed to fetch at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2895-2c04c2221f59a588.js:1:66116
Shop menu:: Error fetching mega menu: Error: Failed to fetch data from https://search.costco.com/api/apps/www_costco_com/query/www_costco_com_megamenu?locale=en-US&loc=1260-3pl%2C1321-wm%2C1477-3pl%2C283-wm%2C561-wm%2C725-wm%2C731-wm%2C758-wm%2C759-wm%2C847_0-cor%2C847_0-cwt%2C847_0-edi%2C847_0-ehs%2C847_0-membership%2C847_0-mpt%2C847_0-spc%2C847_0-wm%2C847_1-cwt%2C847_1-edi%2C847_d-fis%2C847_ge_bal-edi%2C847_lg_n1a-edi%2C847_lux_us81-edi%2C847_NA-cor%2C847_NA-pharmacy%2C847_NA-wm%2C847_ss_u360-edi%2C847_wp_r428-edi%2C951-wm%2C952-wm%2C9847-wcs%2C729-bd%2C&chdmegamenu=true&userLocation=NJ&userPostal=07094: Failed to fetch at https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/2895-2c04c2221f59a588.js:1:66116

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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