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Lighthouse Desktop

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

Audit breakdown by category with detailed findings.

75

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
cdn.waterstones.com/bookjackets/large/9781/4721/9781472158352.jpg86400.0 s51.6 KiB
cdn.waterstones.com/bookjackets/large/9780/2418/9780241816264.jpg86400.0 s39.3 KiB
cdn.waterstones.com/bookjackets/large/9781/4059/9781405978415.jpg86400.0 s39.3 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
cdn.waterstones.com/bookjackets/large/9780/2415/9780241517475.jpg86400.0 s39.2 KiB
www.dwin1.com/3787.js600.0 s16.1 KiB
cdn.waterstones.com/bookjackets/large/9781/5291/9781529157468.jpg86400.0 s35.8 KiB
cdn.waterstones.com/bookjackets/large/9780/0083/9780008384210.jpg86400.0 s30.2 KiB
cdn.waterstones.com/bookjackets/large/9780/5713/9780571378968.jpg86400.0 s29.9 KiB
cdn.waterstones.com/bookjackets/large/9780/0087/9780008742768.jpg86400.0 s26.3 KiB
cdn.waterstones.com/bookjackets/large/9781/8049/9781804941430.jpg86400.0 s25.0 KiB
cdn.waterstones.com/bookjackets/large/9781/3996/9781399624046.jpg86400.0 s21.7 KiB
/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/...14400.0 s12.0 KiB
cdn.waterstones.com/bookjackets/large/9780/3494/9780349450612.jpg86400.0 s16.2 KiB
www.waterstones.com/images/cover404.png14400.0 s4.1 KiB
/cdn-cgi/challenge-platform/h/b/d/9f07b680fd91acc1/177689...0.0 ms1.6 KiB
cdn-cookieyes.com/assets/images/close.svg36000.0 s867 B
challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/10.0 ms208 B
/track.php?fingerprint=f43a9af5-20e2-4661-90c5-00064d1eaf...0.0 ms169 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.22285700000000003] map[node:map[boundingRect:map[bottom:801 height:196 left:45 right:1305 top:605 width:1260] lhId:page-7-DIV nodeLabel:You Might Be Looking For... Bestsellers New Books Coming Soon Signed Fiction No… path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,0,DIV selector:main.main-container > div#pagesmain > div.row > div.image-slider-component snippet:<div class="image-slider-component"> type:node] score:0.211482 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:5020 height:238 left:145 right:388 top:4781 width:243] lhId:page-11-IMG nodeLabel:Book Deals, 50% Off RRP, Shop Now path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,16,DIV,1,DIV,0,A,0,DIV,0,IMG selector:div.grid-images > a > div.feature-image > img snippet:<img srcset=" https://cdn.waterstones.com/images/00396598-1…" sizes="(max-width: 640px) calc(50vw), (max-width: 102…" src="https://cdn.waterstones.com/images/00396598-280x275.jpeg" alt="Book Deals, 50% Off RRP, Shop Now"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1265 height:381 left:45 right:1305 top:884 width:1260] lhId:page-1-DIV nodeLabel:Untitled Empyrean (Not Book Four) Untitled Empyrean (Not Book Four) Rebecca Yar… path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,2,DIV selector:main.main-container > div#pagesmain > div.row > div.span12 snippet:<div class="span12"> type:node] score:0.010884 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:570 height:375 left:0 right:1350 top:196 width:1350] lhId:page-0-IMG nodeLabel:div > div.hero-slide > a > img.mobile-hide path:4,HTML,2,BODY,7,MAIN,2,DIV,1,DIV,2,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div > div.hero-slide > a > img.mobile-hide snippet:<img class="mobile-hide" srcset=" https://cdn.waterstones.com/images/00509410-420x117.jpeg 420w, …" sizes="100vw" src="https://cdn.waterstones.com/images/00509410-1366x379.jpeg" alt=""> type:node]] map[cause:Web font extra:map[type:url value:https://static.waterstones.com/11.19.0/fonts/sourcesanspro-light-webfont.woff2]] map[cause:Web font extra:map[type:url value:https://static.waterstones.com/11.19.0/fonts/sourcesanspro-regular-webfont.woff2]] map[cause:Web font extra:map[type:url value:https://static.waterstones.com/11.19.0/fonts/sourcesanspro-bold-webfont.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:1234 height:278 left:95 right:263 top:956 width:168] lhId:page-8-DIV nodeLabel:Untitled Empyrean (Not Book Four) Untitled Empyrean (Not Book Four) Rebecca Yar… path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,2,DIV,1,DIV,0,DIV,0,DIV,0,DIV selector:div.swiper > div#swiper-wrapper-15b3989a88e74c6d > div.swiper-slide > div snippet:<div> type:node] score:0.000394 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1124 height:168 left:95 right:263 top:956 width:168] lhId:page-12-IMG nodeLabel:div.image-wrap > div.image-container > a > img.ws-lazy path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,2,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.image-wrap > div.image-container > a > img.ws-lazy snippet:<img class="ws-lazy img-book-jacket ws-loaded" width="156" height="240" src="https://cdn.waterstones.com/bookjackets/large/9780/3494/9780349450612.jpg" data-src="https://cdn.waterstones.com/bookjackets/large/9780/3494/9780349450612.jpg" alt=""> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1124 height:238 left:888 right:1057 top:886 width:168] lhId:page-9-DIV nodeLabel:The Seriously Epic Holiday of Lottie Brooks path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,2,DIV,1,DIV,0,DIV,4,DIV,0,DIV,0,DIV,0,DIV selector:div.swiper-slide > div > div.image-wrap > div.image-container snippet:<div class="image-container"> type:node] score:6.4e-05 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1124 height:240 left:499 right:653 top:884 width:155] lhId:page-13-IMG nodeLabel:div.image-wrap > div.image-container > a > img.ws-lazy path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,2,DIV,1,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.image-wrap > div.image-container > a > img.ws-lazy snippet:<img class="ws-lazy img-book-jacket ws-loaded" width="156" height="240" src="https://cdn.waterstones.com/bookjackets/large/9781/5291/9781529157468.jpg" data-src="https://cdn.waterstones.com/bookjackets/large/9781/5291/9781529157468.jpg" alt=""> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:864 height:35 left:1216 right:1295 top:829 width:79] lhId:page-6-A nodeLabel:SEE MORE path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,1,HEADER,0,A selector:div#pagesmain > div.row > header.span12 > a.button snippet:<a class="button button-see-more" href="/books/bestsellers"> type:node] score:3.1e-05 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:5020 height:238 left:145 right:388 top:4781 width:243] lhId:page-11-IMG nodeLabel:Book Deals, 50% Off RRP, Shop Now path:4,HTML,2,BODY,7,MAIN,2,DIV,2,DIV,16,DIV,1,DIV,0,A,0,DIV,0,IMG selector:div.grid-images > a > div.feature-image > img snippet:<img srcset=" https://cdn.waterstones.com/images/00396598-1…" sizes="(max-width: 640px) calc(50vw), (max-width: 102…" src="https://cdn.waterstones.com/images/00396598-280x275.jpeg" alt="Book Deals, 50% Off RRP, Shop Now"> type:node]]] type:subitems]]]

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.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
static.waterstones.com/11.19.0/fonts/icomoon.woff?-o5tg7330 ms

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:198.137 source:map[column:26918 line:2 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.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:77.404 source:map[column:48923 line:1 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:0.479 source:map[column:49635 line:1 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:0.24 source:map[column:49697 line:1 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:0.238 source:map[column:49765 line:1 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:0.394 source:map[column:50698 line:1 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:2.509 source:map[column:82691 line:1 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:0.583 source:map[column:29548 line:25 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:4.575 source:map[column:48945 line:1 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:0.494 source:map[column:52095 line:1 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:45.447 source:map[column:4444 line:27 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.js urlProvider:network]] map[reflowTime:65.774 source:map[column:9385 line:27 type:source-location url:https://static.waterstones.com/11.19.0/js/bundle.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: div > div.hero-slide > a > img.mobile-hide
path: 4,HTML,2,BODY,7,MAIN,2,DIV,1,DIV,2,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,A,0,IMG
selector: div > div.hero-slide > a > img.mobile-hide
snippet: <img class="mobile-hide" srcset=" https://cdn.waterstones.com/images/00509410-420x117.jpeg 420w, …" sizes="100vw" src="https://cdn.waterstones.com/images/00509410-1366x379.jpeg" alt="">

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.

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
value: no origins were preconnected
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
static.waterstones.com/11.19.0/js/bundle.js212.2 KiB169 ms
static.waterstones.com/11.19.0/js/ecommerce.js2.3 KiB
static.waterstones.com/11.19.0/css/bundle.css142.3 KiB488 ms
cdn-cookieyes.com/client_data/7d1896a33bd53d40c20b3666/script.js34.3 KiB313 ms

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.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9781/4721/9781472158352.jpg51.4 KiB45.4 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9780/2418/9780241816264.jpg39.1 KiB33.0 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9781/4059/9781405978415.jpg39.1 KiB33.0 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9780/2415/9780241517475.jpg39.0 KiB32.9 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/override/v1/large/9780/2418/9780241831144.jpg36.4 KiB29.9 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9781/5291/9781529157468.jpg35.6 KiB29.5 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/override/v2/large/9780/2416/9780241684450.jpg34.8 KiB28.6 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9780/0083/9780008384210.jpg30.0 KiB24.2 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9780/5713/9780571378968.jpg29.7 KiB23.6 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9780/0087/9780008742768.jpg26.0 KiB20.0 KiB
div > div.span6 > a > img.ws-lazy div > div.span6 > a > img.ws-lazy
cdn.waterstones.com/images/00509343-374x289.jpeg37.2 KiB19.6 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9781/8049/9781804941430.jpg24.7 KiB19.0 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/override/v2/large/2928/3773/2928377347765.jpg24.7 KiB18.6 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9781/3996/9781399624046.jpg21.5 KiB16.5 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/override/v3/large/9780/0088/9780008808716.jpg21.5 KiB15.7 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/override/v2/large/9781/8052/9781805229674.jpg20.9 KiB15.1 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/override/v1/large/9781/5266/9781526678362.jpg20.4 KiB14.3 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/bookjackets/large/9780/3494/9780349450612.jpg16.0 KiB13.1 KiB
div > div.span6 > a > img.ws-lazy div > div.span6 > a > img.ws-lazy
cdn.waterstones.com/images/00508474-374x289.jpeg28.0 KiB10.4 KiB
div.image-wrap > div.image-container > a > img.ws-lazy div.image-wrap > div.image-container > a > img.ws-lazy
cdn.waterstones.com/override/v2/large/9781/3994/9781399427210.jpg16.0 KiB10.2 KiB
div > div.hero-slide > a > img.mobile-hide div > div.hero-slide > a > img.mobile-hide
cdn.waterstones.com/images/00508273-1366x379.jpeg94.4 KiB10.1 KiB
Manga, Browse div.grid-images > a > div.feature-image > img
cdn.waterstones.com/images/00494718-280x275.jpeg20.9 KiB8.4 KiB
a > span > span.plus-pulse-icon > ::after a > span > span.plus-pulse-icon > ::after
static.waterstones.com/11.19.0/img/plus/plus-stamp.png9.2 KiB8.2 KiB
div > div.span6 > a > img.ws-lazy div > div.span6 > a > img.ws-lazy
cdn.waterstones.com/images/00508787-374x289.jpeg24.5 KiB6.9 KiB

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: 270 ms
URLTime Spent
waterstones.com/270 ms
www.waterstones.com/0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
You Might Be Looking For... Bestsellers New Books Coming Soon Signed Fiction No… main.main-container > div#pagesmain > div.row > div.image-slider-component
0.211
Untitled Empyrean (Not Book Four) Untitled Empyrean (Not Book Four) Rebecca Yar… main.main-container > div#pagesmain > div.row > div.span12
0.011
Untitled Empyrean (Not Book Four) Untitled Empyrean (Not Book Four) Rebecca Yar… div.swiper > div#swiper-wrapper-15b3989a88e74c6d > div.swiper-slide > div
0.000
The Seriously Epic Holiday of Lottie Brooks div.swiper-slide > div > div.image-wrap > div.image-container
0.000
SEE MORE div#pagesmain > div.row > header.span12 > a.button
0.000
0.000

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

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 60 ms 26.4 KiB
URLTransfer SizeEst Savings
static.waterstones.com/11.19.0/css/bundle.css142.3 KiB26.4 KiB

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: 110 ms 135.4 KiB
URLTransfer SizeEst Savings
static.waterstones.com/11.19.0/css/bundle.css142.3 KiB135.4 KiB

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: 110 ms 276.1 KiB
URLTransfer SizeEst Savings
static.waterstones.com/11.19.0/js/bundle.js211.8 KiB152.8 KiB
www.googletagmanager.com/gtag/js?id=G-P4C39TQPV3&cx=c&gtm=4e64k0153.0 KiB63.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-N66L6Q141.8 KiB60.0 KiB

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 that use WebXR are not currently eligible for 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

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-cgi/challenge-platform/h/b/flow/ov1/132605135:177688...271.9 KiB
static.waterstones.com/11.19.0/js/bundle.js212.2 KiB
www.googletagmanager.com/gtag/js?id=G-P4C39TQPV3&cx=c&gtm=4e64k0153.1 KiB
static.waterstones.com/11.19.0/css/bundle.css142.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-N66L6Q142.2 KiB
cdn.waterstones.com/images/00508272-1000x667.jpeg105.7 KiB
/cdn-cgi/challenge-platform/h/b/turnstile/f/ov2/av0/rch/g...94.9 KiB
cdn.waterstones.com/images/00508273-1366x379.jpeg94.7 KiB
cdn.waterstones.com/images/00507435-1000x667.jpeg80.5 KiB
www.waterstones.com/77.9 KiB

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
div > div.hero-slide > a > img.mobile-hide div > div.hero-slide > a > img.mobile-hide
cdn.waterstones.com/images/00508273-1366x379.jpeg
div > div.hero-slide > a > img.mobile-hide div > div.hero-slide > a > img.mobile-hide
cdn.waterstones.com/images/00509410-1366x379.jpeg
div > div.hero-slide > a > img.mobile-hide div > div.hero-slide > a > img.mobile-hide
cdn.waterstones.com/images/00507434-1366x379.jpeg
div > div.hero-slide > a > img.mobile-hide div > div.hero-slide > a > img.mobile-hide
cdn.waterstones.com/images/00508273-1366x379.jpeg
div > div.hero-slide > a > img.mobile-hide div > div.hero-slide > a > img.mobile-hide
cdn.waterstones.com/images/00509410-1366x379.jpeg
div > div.hero-slide > a > img.mobile-hide div > div.hero-slide > a > img.mobile-hide
cdn.waterstones.com/images/00507434-1366x379.jpeg
div > div.hero-slide > a > img.mobile-hide div > div.hero-slide > a > img.mobile-hide
cdn.waterstones.com/images/00508273-1366x379.jpeg

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

●Max Potential First Input Delay 120 ms
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify JavaScript
●User Timing marks and measures 7 user timings
●JavaScript execution time 0.6 s
●Minimizes main-thread work 1.9 s
●Avoid long main-thread tasks 2 long tasks found
●Network Requests
●Network Round Trip Times 30 ms
●Server Backend Latencies 110 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 190 ms
○INP breakdown
○Avoid non-composited animations
97

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.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Go to slide 1 div.hero-banner > ul.slick-dots > li > button
Go to slide 2 div.hero-banner > ul.slick-dots > li.slick-active > button
Go to slide 3 div.hero-banner > ul.slick-dots > li > button

These items highlight common accessibility best practices.

○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.
●`button`, `link`, and `menuitem` elements have accessible names
●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 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
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●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
○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
○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
○Links are distinguishable without relying on color.
○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
www.waterstones.com/cdn-cgi/challenge-platform/scripts/jsd/main.js
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.
www.waterstones.com/cdn-cgi/challenge-platform/scripts/jsd/main.js
Fledge
www.waterstones.com/cdn-cgi/challenge-platform/scripts/jsd/main.js

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
www.waterstones.com/manifest/webmanifest
Failed to load resource: the server responded with a status of 403 ()
www.waterstones.com/manifest/webmanifest
Failed to load resource: the server responded with a status of 403 ()
www.waterstones.com/ line 13725, col 0
Manifest fetch from https://www.waterstones.com/manifest/webmanifest failed, code 403
www.waterstones.com/
Manifest fetch from https://www.waterstones.com/manifest/webmanifest failed, code 403
www.waterstones.com/ line 11, col 8753
TurnstileError: [Cloudflare Turnstile] Error: 600010. at v (https://challenges.cloudflare.com/turnstile/v0/api.js:1:10922) at L (https://challenges.cloudflare.com/turnstile/v0/api.js:1:40040) at nrWrapper (https://www.waterstones.com/:12:8712)

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.

URL
static.waterstones.com/11.19.0/js/bundle.js
●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
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
82

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.waterstones.com/books/bestsellersSEE MORE
www.waterstones.com/category/cultural-highlightsSEE MORE
www.waterstones.com/campaign/special-editionsSEE MORE
www.waterstones.com/campaign/coming-soonSEE MORE
www.waterstones.com/category/health-lifestyle/self-help-and-personal-developmentSEE MORE
www.waterstones.com/campaign/paperback-offersSEE MORE
www.waterstones.com/category/fictionSEE MORE
www.waterstones.com/non-fiction-booksSEE MORE
www.waterstones.com/booklist/788740/homepage-weekend-reviewsSEE MORE
www.waterstones.com/category/childrens-teenageSEE MORE
www.waterstones.com/category/childrens-teenage/facet/500SEE MORE
www.waterstones.com/category/stationery-giftsSEE MORE

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

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
… div.navs-container > ul.navs > li > a.nav-item-highlights
… div.navs-container > ul.navs > li > a.nav-item-fiction
… div.navs-container > ul.navs > li > a.nav-item-non-fiction
… div.navs-container > ul.navs > li > a.nav-item-children's
… div.navs-container > ul.navs > li > a.nav-item-stationery
… div.navs-container > ul.navs > li > a.nav-item-games
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li > a.nav-item-top
… li.subnav > ul.navs > li > a.nav-item-what's
… li.subnav > ul.navs > li > a.nav-item-favourite
… li.subnav > ul.navs > li > a.nav-item-favourite
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li > a.nav-item-top
… li.subnav > ul.navs > li > a.nav-item-fiction
… li.subnav > ul.navs > li > a.nav-item-crime
… li.subnav > ul.navs > li > a.nav-item-science
… li.subnav > ul.navs > li > a.nav-item-graphic
… li.subnav > ul.navs > li > a.nav-item-teenage
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li > a.nav-item-top
… li.subnav > ul.navs > li > a.nav-item-art
… li.subnav > ul.navs > li > a.nav-item-biography
… li.subnav > ul.navs > li > a.nav-item-history
… li.subnav > ul.navs > li > a.nav-item-home
… li.subnav > ul.navs > li > a.nav-item-nature
… li.subnav > ul.navs > li > a.nav-item-smart
… li.subnav > ul.navs > li > a.nav-item-spirituality
… li.subnav > ul.navs > li > a.nav-item-sport
… li.subnav > ul.navs > li > a.nav-item-travel
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li > a.nav-item-top
… li.subnav > ul.navs > li > a.nav-item-pre-school
… li.subnav > ul.navs > li > a.nav-item-children's
… li.subnav > ul.navs > li > a.nav-item-teenage
… li.subnav > ul.navs > li > a.nav-item-education
… li.subnav > ul.navs > li > a.nav-item-hobbies
… li.subnav > ul.navs > li > a.nav-item-stationery
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li > a.nav-item-gifts
… li.subnav > ul.navs > li > a.nav-item-children's
… li.subnav > ul.navs > li > a.nav-item-stationery
… li.subnav > ul.navs > li > a.nav-item-book
… li.subnav > ul.navs > li > a.nav-item-arts
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li > a.nav-item-games
… li.subnav > ul.navs > li.back > a.nav-item
… li.subnav > ul.navs > li.back > a.nav-item

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

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