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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

25

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

A 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
superfiliate-cdn.com/storefront.js?shop=weareallbirds.myshopify.com60.0 s80.6 KiB
cdn.cookielaw.org/scripttemplates/202506.1.0/otBannerSdk.js86400.0 s119.8 KiB
/script/ae590735d7ef6a7650efad9ec16ba3a4.experiment.js?in...60.0 s43.5 KiB
beacon.riskified.com/?shop=weareallbirds.myshopify.com600.0 s17.3 KiB
/app/weareallbirds.myshopify.com/govx.js?shop=weareallbir...300.0 s7.0 KiB
/3.31.0/modern/plugins/rsa-plugins-legacyEncryptionUtils....3600.0 s5.3 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js86400.0 s9.1 KiB
jssdk.allbirds.com/3.31.0/modern/plugins/rsa-plugins-RetryQueue.min.js3600.0 s3.8 KiB
jssdk.allbirds.com/3.31.0/modern/plugins/rsa-plugins-common.min.js3600.0 s3.7 KiB
js.iterable.com/analytics.js0.0 ms2.7 KiB
/cdn/shopifycloud/portable-wallets/latest/accelerated-che...300.0 s2.4 KiB
/w37htfhcq2/vendor/f0ff0959-79f9-4c1e-a197-0361a8f1cbb2/l...60.0 s2.1 KiB
/a/elevar/static/configs/f36f1dd17dff728b044638bc4ad9f157...1.0 s2.1 KiB
/logos/0b9f74e8-b9c3-40a2-9197-b5a394dea570/a2305201-1bee...86400.0 s4.9 KiB
/configs/f36f1dd17dff728b044638bc4ad9f1579fa7cda1/config.js1.0 s1.9 KiB
jssdk.allbirds.com/3.31.0/modern/plugins/rsa-plugins-remote-XhrQueue.min.js3600.0 s1.7 KiB
cdn.trackjs.com/agent/v3/latest/t.js604800.0 s11.2 KiB
/a4flkt7l2b/z9gd/f0ff0959-79f9-4c1e-a197-0361a8f1cbb2/www...0.0 ms1.1 KiB
/a/elevar/static/configs/f36f1dd17dff728b044638bc4ad9f157...1.0 s1.0 KiB
jssdk.allbirds.com/3.31.0/modern/plugins/rsa-plugins-remote-GoogleLinker.min.js3600.0 s1.3 KiB
/3.31.0/modern/plugins/rsa-plugins-remote-OneTrustConsent...3600.0 s1.2 KiB
/3.31.0/modern/plugins/rsa-plugins-remote-ExternalAnonymo...3600.0 s1.2 KiB
jssdk.allbirds.com/3.31.0/modern/plugins/rsa-plugins.js3600.0 s1.1 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg86400.0 s2.1 KiB
cdn.jsdelivr.net/npm/@loophq/onstore-sdk@latest/dist/loop-onstore-sdk.min.js604800.0 s8.3 KiB
/3.31.0/modern/plugins/rsa-plugins-remote-StorageEncrypti...3600.0 s907 B
shop.app/checkouts/internal/preloads.js?locale=en-US&shop_id=1104416860.0 s559 B
/w37htfhcq2/z9g/digibox.gif?c=1775319803325&h=www.allbird...0.0 ms390 B
/usage.gif?token=5cfec9b7f4574339a9ce7274f57dedb4&correla...0.0 ms273 B
cdn.cookielaw.org/logos/static/ot_close.svg86400.0 s645 B
/img/image-l.gif?t=17753198078840.6236373184952533&c=hwhn...0.0 ms207 B
/img/image-l.gif?t=17753198082130.3501298571311685&c=hwhn...0.0 ms206 B
/img/image-l.gif?t=17753198083330.018812185977588047&c=hw...0.0 ms206 B
/img/image-l.gif?t=17753198084500.42513680076717086&c=hwh...0.0 ms206 B
/img/image-l.gif?t=17753198085630.20114795330810653&c=hwh...0.0 ms206 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

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:129.717 source:map[column:442 line:4 type:source-location url:https://cdn.trackjs.com/agent/v3/latest/t.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:60.781 source:map[column:132735 line:7 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:2.01 source:map[column:113693 line:7 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:0.29 source:map[column:112636 line:7 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:0.123 source:map[column:109855 line:7 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:16.592 source:map[column:5300 line:0 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/swiper-core.js urlProvider:network]] map[reflowTime:13.749 source:map[column:11285 line:0 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/swiper-core.js urlProvider:network]] map[reflowTime:2.914 source:map[column:17776 line:0 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/swiper-core.js urlProvider:network]] map[reflowTime:54.344 source:map[column:82363 line:7 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:11.459 source:map[column:100064 line:7 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:17.346 source:map[column:379 line:0 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/use-viewport-size.js urlProvider:network]] map[reflowTime:2.909 source:map[column:87669 line:7 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:1.513 source:map[column:87585 line:7 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:0.291 source:map[column:483 line:0 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/use-sticky-scroll-behavior.js urlProvider:network]] map[reflowTime:1.678 source:map[column:1406 line:0 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/scrollbar.js urlProvider:network]] map[reflowTime:5.419 source:map[column:56453 line:0 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/swiper-core.js urlProvider:network]] map[reflowTime:29.074 source:map[column:119823 line:0 type:source-location url:https://www.allbirds.com/cdn/wpm/bcfa8229ew36b6053dp1e134caame9d83f21m.js urlProvider:network]] map[reflowTime:5.182 source:map[column:51544 line:0 type:source-location url:https://www.allbirds.com/cdn/shop/t/4054/assets/swiper-core.js urlProvider:network]] map[reflowTime:3.009 source:map[column:67927 line:0 type:source-location url:https://jssdk.allbirds.com/v3/modern/rsa.min.js urlProvider:network]] map[reflowTime:36.458 source:map[type:text value:[unattributed]]]]

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
div.swiper-slide > div > div.relative > img.rounded-3xl div.swiper-slide > div > div.relative > img.rounded-3xl
/cdn/shop/files/26Q1_VarsityAiry_HowToStyle-01_Desktop-Mo...300.2 KiB202.6 KiB
Men's Varsity Airy - Mushroom (Blizzard Sole) div.swiper-wrapper > div.swiper-slide > a.block > img.w-full
/cdn/shop/files/A12569_26Q1_Mens-Varsity-Airy-Mushroom-Bl...158.3 KiB139.4 KiB
Women's Varsity Airy - Auburn (Natural White Sole) div.swiper-wrapper > div.swiper-slide > a.block > img.w-full
/cdn/shop/files/A12433_26Q2_Womens-Varsity-Airy-Auburn-Na...156.3 KiB137.6 KiB
Men's Dasher NZ - Light Burnt Olive (Natural White Sole) div.swiper-wrapper > div.swiper-slide > a.block > img.w-full
/cdn/shop/files/A12519_26Q1_Dasher-NZ-Light-Burnt-Olive-N...144.5 KiB127.2 KiB
div.my-10 > div.grid > div.group > img.object-cover div.my-10 > div.grid > div.group > img.object-cover
/cdn/shop/files/26Q1_VarsityAiry_Site_3xPromo-01_Desktop-...224.3 KiB112.7 KiB
ul.swiper-wrapper > li.swiper-slide > span.hidden > img.block ul.swiper-wrapper > li.swiper-slide > span.hidden > img.block
/cdn/shop/files/26Q1_VarsityAiry_Site_Homepage_Hero_Mobil...240.2 KiB105.1 KiB
div.swiper-slide > div > div.relative > img.rounded-3xl div.swiper-slide > div > div.relative > img.rounded-3xl
/cdn/shop/files/26Q1_VarsityAiry_HowToStyle-01_Desktop-Mo...179.3 KiB93.9 KiB
Men's Tree Runner NZ - Burnt Olive (Burnt Olive Sole) div.group > div.relative > a.absolute > img.pointer-events-none
/cdn/shop/files/A12485_26Q1_Tree-Runner-NZ-Burnt-Olive-Bu...81.5 KiB59.2 KiB
Women's Tree Glider - Warm White/Multi (Natural White Sole) div.group > div.relative > a.absolute > img.pointer-events-none
/cdn/shop/files/A12366_26Q1_Tree-Glider-Warm-White-Multi-...75.3 KiB54.7 KiB
Men's Tree Runner - Jet Black (White Sole) div.group > div.relative > a.absolute > img.pointer-events-none
/cdn/shop/files/TR3MJBW080_SHOE_LEFT_GLOBAL_MENS_TREE_RUN...68.3 KiB49.6 KiB
Women's Breezer Mary Jane - Warm Red (Dark Anthracite Sole) div.group > div.relative > a.absolute > img.pointer-events-none
/cdn/shop/files/A12121_25Q4_Breezer-Mary-Jane-Warm-Red-Da...64.9 KiB47.2 KiB
Women's Varsity - Multi (Natural White Sole) div.group > div.relative > a.absolute > img.pointer-events-none
/cdn/shop/files/A12581_26Q2_Womens-Varsity-Multi-Natural-...62.1 KiB45.1 KiB
Men's Varsity - Parchment (Blizzard Sole) div.group > div.relative > a.absolute > img.pointer-events-none
/cdn/shop/files/A12270_26Q1_Mens-Varsity-Parchment-Blizza...51.7 KiB37.5 KiB
Men's Varsity Terralux™ - Light Grey (Light Grey Sole) div.group > div.relative > a.absolute > img.pointer-events-none
/cdn/shop/files/A12526_26Q2_Varsity-Terralux-Light-Grey-L...47.7 KiB34.6 KiB
Women's Tree Breezer - Jet Black (Black Sole) div.group > div.relative > a.absolute > img.pointer-events-none
/cdn/shop/files/TB1WJBK_SHOE_LEFT_GLOBAL_WOMENS_TREE_BREE...38.4 KiB27.9 KiB
ul.swiper-wrapper > li.swiper-slide > span > img.category-row-item-hover-image ul.swiper-wrapper > li.swiper-slide > span > img.category-row-item-hover-image
/cdn/shop/files/26Q1_MarchBAU_Site_Homepage_CategoryRow-0...32.1 KiB16.2 KiB
ul.swiper-wrapper > li.swiper-slide > span > img.category-row-item-hover-image ul.swiper-wrapper > li.swiper-slide > span > img.category-row-item-hover-image
/cdn/shop/files/26Q1_MarchBAU_Site_Homepage_CategoryRow-0...30.4 KiB15.3 KiB
ul.swiper-wrapper > li.swiper-slide > span > img.category-row-item-hover-image ul.swiper-wrapper > li.swiper-slide > span > img.category-row-item-hover-image
/cdn/shop/files/26Q1_MarchBAU_Site_Homepage_CategoryRow-0...27.0 KiB13.6 KiB
ul.swiper-wrapper > li.swiper-slide > span > img.category-row-item-hover-image ul.swiper-wrapper > li.swiper-slide > span > img.category-row-item-hover-image
/cdn/shop/files/26Q1_MarchBAU_Site_Homepage_CategoryRow-0...23.5 KiB11.8 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:141.837 label:Time to first byte subpart:timeToFirstByte] map[duration:159.379 label:Resource load delay subpart:resourceLoadDelay] map[duration:305.51 label:Resource load duration subpart:resourceLoadDuration] map[duration:2863.396 label:Element render delay subpart:elementRenderDelay]]
lhId: page-19-IMG
nodeLabel: ul.swiper-wrapper > li.swiper-slide > span.hidden > img.block
path: 1,HTML,1,BODY,10,MAIN,1,SECTION,0,DIV,0,DIV,0,UL,1,LI,1,SPAN,0,IMG
selector: ul.swiper-wrapper > li.swiper-slide > span.hidden > img.block
snippet: <img fetchpriority="auto" alt="" class="block md:hidden w-full h-full object-cover" height="1846" loading="eager" src="//www.allbirds.com/cdn/shop/files/26Q1_DasherNZ_Site_Homepage_Hero_Mobile_…" width="1024">

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-19-IMG
nodeLabel: ul.swiper-wrapper > li.swiper-slide > span.hidden > img.block
path: 1,HTML,1,BODY,10,MAIN,1,SECTION,0,DIV,0,DIV,0,UL,1,LI,1,SPAN,0,IMG
selector: ul.swiper-wrapper > li.swiper-slide > span.hidden > img.block
snippet: <img fetchpriority="auto" alt="" class="block md:hidden w-full h-full object-cover" height="1846" loading="eager" src="//www.allbirds.com/cdn/shop/files/26Q1_DasherNZ_Site_Homepage_Hero_Mobile_…" width="1024">

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

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.

URLTransfer SizeDuration
/script/ae590735d7ef6a7650efad9ec16ba3a4.experiment.js?in...43.5 KiB1.3 s
/cdn/shopifycloud/portable-wallets/latest/accelerated-che...2.4 KiB
www.allbirds.com/cdn/shop/t/4054/assets/cart-drawer-section.css2.2 KiB

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: 839 ms
URLTime Spent
allbirds.com/839 ms
www.allbirds.com/0.0 ms

Diagnostics

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.1 s 819.1 KiB
URLTransfer SizeEst Savings
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js155.2 KiB77.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-TH8KRSBJ181.3 KiB75.6 KiB
/w37htfhcq2/vendor/f0ff0959-79f9-4c1e-a197-0361a8f1cbb2/m...116.1 KiB68.4 KiB
www.googletagmanager.com/gtag/destination?id=G-KB1068K0E6&cx=c&gtm=4e6411167.9 KiB67.5 KiB
www.googletagmanager.com/gtag/js?id=AW-736740096&cx=c&gtm=4e6420h2143.6 KiB64.0 KiB
www.googletagmanager.com/gtag/js?id=AW-786649265&cx=c&gtm=4e6420h2143.6 KiB63.4 KiB
www.googletagmanager.com/gtag/js?id=AW-935878905&cx=c&gtm=4e6411143.7 KiB63.1 KiB
cdn.cookielaw.org/scripttemplates/202506.1.0/otBannerSdk.js119.7 KiB62.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-WWZFMZRX153.7 KiB59.0 KiB
superfiliate-cdn.com/storefront.js?shop=weareallbirds.myshopify.com80.2 KiB53.6 KiB
www.allbirds.com/cdn/shop/t/4054/assets/theme2.js33.3 KiB26.1 KiB
www.allbirds.com/cdn/wpm/bcfa8229ew36b6053dp1e134caame9d83f21m.js56.8 KiB25.6 KiB
www.allbirds.com/cdn/shop/t/4054/assets/vue.esm-bundler.js60.7 KiB23.5 KiB
/assets/chat-sdk/vendor-node_modules_reduxjs_toolkit_dist...46.9 KiB23.1 KiB
/script/ae590735d7ef6a7650efad9ec16ba3a4.experiment.js?in...43.2 KiB22.8 KiB
www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js64.2 KiB22.5 KiB
s.pinimg.com/ct/lib/main.34af66ec.js35.9 KiB20.4 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
cdn.trackjs.com/agent/v3/latest/t.js4.5 s3.3 s5.2 ms
www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js3.2 s571 ms2.1 ms
Unattributable2.8 s172 ms0.0 ms
www.allbirds.com/2.3 s175 ms47 ms
www.googletagmanager.com/gtm.js?id=GTM-WWZFMZRX946 ms823 ms112 ms
/app/weareallbirds.myshopify.com/govx.js?shop=weareallbir...862 ms858 ms3.1 ms
www.googletagmanager.com/gtm.js?id=GTM-TH8KRSBJ823 ms678 ms134 ms
/w37htfhcq2/vendor/f0ff0959-79f9-4c1e-a197-0361a8f1cbb2/m...796 ms629 ms74 ms
www.googletagmanager.com/gtag/js?id=AW-935878905&cx=c&gtm=4e6411595 ms424 ms81 ms
www.googletagmanager.com/gtag/destination?id=G-KB1068K0E6&cx=c&gtm=4e6411565 ms467 ms92 ms
cdn.cookielaw.org/scripttemplates/202506.1.0/otBannerSdk.js559 ms393 ms87 ms
cdn.gladly.com/assets/chat-sdk/apiBootstrap~3d2f3ae3ce0b8979.js525 ms447 ms74 ms
jssdk.allbirds.com/v3/modern/rsa.min.js486 ms446 ms16 ms
www.googletagmanager.com/gtag/js?id=AW-736740096&cx=c&gtm=4e6420h2483 ms410 ms71 ms
www.googletagmanager.com/gtag/js?id=AW-786649265&cx=c&gtm=4e6420h2439 ms370 ms64 ms
/script/ae590735d7ef6a7650efad9ec16ba3a4.experiment.js?in...425 ms299 ms28 ms
www.allbirds.com/cdn/wpm/bcfa8229ew36b6053dp1e134caame9d83f21m.js388 ms336 ms39 ms
beacon.riskified.com/?shop=weareallbirds.myshopify.com256 ms238 ms8.8 ms
www.allbirds.com/cdn/shop/t/4054/assets/autoplay.js256 ms256 ms0.1 ms
www.allbirds.com/cdn/shopifycloud/perf-kit/shopify-perf-kit-3.3.1.min.js255 ms166 ms24 ms
/cdn/shopifycloud/shop-js/modules/v2/chunk.index_4uAqGWkW...175 ms168 ms1.2 ms
superfiliate-cdn.com/storefront.js?shop=weareallbirds.myshopify.com154 ms107 ms46 ms
/cdn/shopifycloud/storefront/assets/shopify_pay/storefron...152 ms135 ms14 ms
www.allbirds.com/cdn/shop/t/4054/assets/swiper-core.js137 ms27 ms0.6 ms
/cdn/s/trekkie.storefront.793024e5c781b83428b9784ec5054da...134 ms110 ms21 ms
/cdn/shopifycloud/storefront/assets/storefront/load_featu...101 ms96 ms3.8 ms
cdn.gladly.com/chat-sdk/widget.js?q=177531980274398 ms83 ms15 ms
/cdn/shopifycloud/consent-tracking-api/v0.1/consent-track...71 ms66 ms0.3 ms
cdn.cookielaw.org/scripttemplates/otSDKStub.js56 ms40 ms4.5 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 Evaluation12.7 s
Other5.1 s
Style & Layout2.3 s
Script Parsing & Compilation1.2 s
Parse HTML & CSS932 ms
Rendering830 ms
Garbage Collection253 ms

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.

Estimated savings: 0.0 ms 19.5 KiB
URLTransfer SizeEst Savings
21.8 KiB19.5 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/cdn/shop/files/26Q1_DasherNZ_Site_Homepage_Hero_Desktop_...535.1 KiB
/cdn/shop/files/26Q1_VarsityAiry_Site_Homepage_Hero_Deskt...504.3 KiB
/cdn/shopifycloud/checkout-web/assets/c1/hooks-useHasOrde...344.7 KiB
/cdn/shop/files/26Q1_VarsityAiry_HowToStyle-01_Desktop-Mo...301.1 KiB
/cdn/shop/files/26Q1_VarsityAiry_Site_Homepage_Hero_Mobil...241.1 KiB
/cdn/shop/files/26Q1_VarsityAiry_Site_3xPromo-01_Desktop-...225.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-TH8KRSBJ181.7 KiB
/cdn/shop/files/26Q1_VarsityAiry_HowToStyle-01_Desktop-Mo...180.2 KiB
www.googletagmanager.com/gtag/destination?id=G-KB1068K0E6&cx=c&gtm=4e6411168.0 KiB
/cdn/shop/files/26Q1_DasherNZ_Site_Navigation_FullTile_Wo...162.7 KiB

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

●Layout shift culprits
●Optimize DOM size
●Font display
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 21 user timings
●Avoid long main-thread tasks 20 long tasks found
●Avoid non-composited animations 1 animated element found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 410 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 10 ms
●Avoid large layout shifts 6 layout shifts found
○INP breakdown
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
●`[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.
●Select elements have associated label elements.
●`button`, `link`, and `menuitem` elements have accessible names
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[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
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[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
○ARIA IDs are unique
○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
○Skip links are focusable.
○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
AttributionReporting
cdn.trackjs.com/agent/v3/latest/t.js line 22, col 148

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
cdn.cookielaw.org/consent/undefined/OtAutoBlock.js
Failed to load resource: the server responded with a status of 404 ()
/main.js?widget_id=l3cmm7m70dmwcb2&shop=weareallbirds.mys...
Failed to load resource: the server responded with a status of 429 ()
●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 DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

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.

Link destinationLink Text
www.allbirds.co.uk/policies/privacy-policyMore information

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

○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
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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