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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.

52

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
/lens/125/assets/university-of-bath/images/awards/sport-u...86400.0 s431.0 KiB
f.vimeocdn.com/p/4.46.43/js/player.module.js1209600.0 s211.5 KiB
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js604800.0 s123.2 KiB
/lens/125/assets/university-of-bath/images/awards/TEF-tri...86400.0 s28.7 KiB
f.vimeocdn.com/p/4.46.43/js/vendor.module.js1209600.0 s93.3 KiB
player.vimeo.com/api/player.js1800.0 s9.0 KiB
/cdn-cgi/challenge-platform/h/b/d/9f07390bbd684562/177688...0.0 ms6.5 KiB
/cdn-cgi/challenge-platform/h/b/d/9f07390afb8b4562/177688...0.0 ms5.9 KiB
www.gstatic.com/eureka/clank/147/cast_sender.js86400.0 s13.4 KiB
/lens/125/assets/university-of-bath/images/awards/nss-stu...86400.0 s9.7 KiB
/lens/125/assets/university-of-bath/images/awards/daily-m...86400.0 s8.2 KiB
/cdn-cgi/challenge-platform/h/b/d/9f07390bbd714562/177688...0.0 ms3.0 KiB
/lens/125/assets/university-of-bath/images/awards/qs-empl...86400.0 s7.3 KiB
/lens/125/assets/university-of-bath/images/awards/qs-soci...86400.0 s7.1 KiB
/lens/125/assets/university-of-bath/images/awards/cug-2nd...86400.0 s6.9 KiB
/lens/125/assets/university-of-bath/images/awards/qs-worl...86400.0 s6.7 KiB
/lens/125/assets/university-of-bath/images/awards/top-10-...86400.0 s6.4 KiB
/lens/125/assets/university-of-bath/images/awards/qs-sust...86400.0 s6.0 KiB
f.vimeocdn.com/p/4.46.43/css/player.css1209600.0 s23.9 KiB
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s5.5 KiB
/lens/125/assets/university-of-bath/images/logo/uob-logo-...86400.0 s3.0 KiB
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s2.6 KiB
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s2.0 KiB
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s1.9 KiB
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s1.6 KiB
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s1.3 KiB
/cdn-cgi/challenge-platform/h/b/d/9f07390afb964562/177688...0.0 ms450 B
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s936 B
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s918 B
/lens/125/assets/university-of-bath/images/utility/arrow-...86400.0 s903 B
/lens/125/assets/university-of-bath/images/icons/tab-left...86400.0 s885 B
/lens/125/assets/university-of-bath/images/icons/tab-righ...86400.0 s861 B
/lens/125/assets/university-of-bath/images/style/social-i...86400.0 s860 B
/lens/125/assets/university-of-bath/images/utility/arrow-...86400.0 s824 B
/lens/125/assets/university-of-bath/images/icons/white-ch...86400.0 s742 B
/lens/125/assets/university-of-bath/images/icons/white-ch...86400.0 s742 B
/lens/125/assets/university-of-bath/images/icons/global-s...86400.0 s608 B
/lens/125/assets/university-of-bath/images/icons/global-n...86400.0 s526 B
challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/10.0 ms208 B
challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/10.0 ms208 B
challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/10.0 ms208 B
challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/10.0 ms208 B
f.vimeocdn.com/p/4.46.43/js/player.module.js1209600.0 s0 B
f.vimeocdn.com/p/4.46.43/js/vendor.module.js1209600.0 s0 B
f.vimeocdn.com/p/4.46.43/css/player.css1209600.0 s0 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:7.951 source:map[column:27323 line:2 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.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:49.207 source:map[type:text value:[unattributed]]] map[reflowTime:1.738 source:map[column:49637 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.3 source:map[column:50335 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.145 source:map[column:50393 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.143 source:map[column:50457 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.482 source:map[column:185314 line:0 type:source-location url:https://cdnjs.cloudflare.com/ajax/libs/material-components-web/5.1.0/material-components-web.min.js urlProvider:network]] map[reflowTime:0.709 source:map[column:177859 line:0 type:source-location url:https://cdnjs.cloudflare.com/ajax/libs/material-components-web/5.1.0/material-components-web.min.js urlProvider:network]] map[reflowTime:0.154 source:map[column:15 line:293 type:source-location url:https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/tabs.js urlProvider:network]] map[reflowTime:3.97 source:map[column:84997 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.333 source:map[column:51395 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:4.172 source:map[column:49615 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.752 source:map[column:23 line:93 type:source-location url:https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/awards-footer.js urlProvider:network]] map[reflowTime:0.474 source:map[column:15 line:85 type:source-location url:https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/awards-footer.js urlProvider:network]] map[reflowTime:1.059 source:map[column:83946 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.676 source:map[column:84992 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.031 source:map[column:55 line:887 type:source-location url:https://www.googletagmanager.com/gtm.js?id=GTM-NN6ZCP 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-DIV
nodeLabel: body.external-homepage > section.hero > div.hero-bg
path: 1,HTML,1,BODY,5,SECTION,0,DIV
selector: body.external-homepage > section.hero > div.hero-bg
snippet: <div class="hero-bg" style="background-image: url(&quot;https://live.staticflickr.com/65535/55176118597_0b87…&quot;);" role="img" aria-label="" ""="">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
www.bath.ac.uk/http/1.1
www.bath.ac.uk/lens/125/css/university-of-bath/university-of-bath.csshttp/1.1
/lens/125/assets/university-of-bath/images/awards/qs-worl...http/1.1
/lens/125/assets/university-of-bath/images/awards/top-10-...http/1.1
/lens/125/assets/university-of-bath/images/awards/daily-m...http/1.1
/lens/125/assets/university-of-bath/images/awards/sport-u...http/1.1
/lens/125/assets/university-of-bath/images/awards/TEF-tri...http/1.1
/lens/125/assets/university-of-bath/images/awards/qs-empl...http/1.1
/lens/125/assets/university-of-bath/images/awards/qs-sust...http/1.1
/lens/125/assets/university-of-bath/images/awards/cug-2nd...http/1.1
/lens/125/assets/university-of-bath/images/awards/nss-stu...http/1.1
/lens/125/assets/university-of-bath/images/awards/qs-soci...http/1.1
www.bath.ac.uk/lens/125/assets/school-of-management/js/infographics.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/hero-parallax.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/sticky-nav.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/hammer.min.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/jquery.hammer.jshttp/1.1
/lens/125/assets/university-of-bath/js/vendor/jquery.wayp...http/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/tabs.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/carousel.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/in-page-nav.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/tables.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/utm-forms.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/awards-footer.jshttp/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/images/favicon/manifest.jsonhttp/1.1
/lens/125/assets/university-of-bath/images/logo/uob-logo-...http/1.1
/lens/125/assets/university-of-bath/images/icons/global-n...http/1.1
/lens/125/assets/university-of-bath/images/icons/global-s...http/1.1
/lens/125/assets/university-of-bath/images/icons/tab-left...http/1.1
/lens/125/assets/university-of-bath/images/icons/tab-righ...http/1.1
/lens/125/assets/university-of-bath/images/utility/arrow-...http/1.1
/lens/125/assets/university-of-bath/images/utility/arrow-...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/style/social-i...http/1.1
/lens/125/assets/university-of-bath/images/icons/white-ch...http/1.1
/lens/125/assets/university-of-bath/images/icons/white-ch...http/1.1
www.bath.ac.uk/lens/125/assets/university-of-bath/images/favicon/favicon.icohttp/1.1

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
www.bath.ac.uk/lens/125/css/university-of-bath/university-of-bath.css42.5 KiB2.2 s
/css?family=Noto+Sans:400,400i,700,700i&subset=cyrillic,l...1.4 KiB821 ms
/css?family=Noto+Sans:400,400i,700,700i&subset=cyrillic,l...1.0 KiB173 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
A researcher holding a bottle of oil div.flex-row > div.half-block > figure.stretch > img.stretch
live.staticflickr.com/65535/52169322768_4eddba5e14_o_d.jpg719.5 KiB659.9 KiB
Students relaxing by the lake on campus a.dual-block > div.flex-wrapper > figure.dual-block-image > img.stretch
live.staticflickr.com/65535/52153161721_23f407b003_o_d.jpg249.7 KiB240.8 KiB
Students walking along the Parade on campus a.dual-block > div.flex-wrapper > figure.dual-block-image > img.stretch
live.staticflickr.com/65535/52153402809_5013aa45ce_o_d.jpg213.4 KiB204.5 KiB
div.flex-row > div.half-block > figure.stretch > img.stretch div.flex-row > div.half-block > figure.stretch > img.stretch
live.staticflickr.com/65535/55220893532_c6c158d25c.jpg188.5 KiB147.9 KiB
/video/2060692653-6b8fc51276a25d18b479a98bd842e92ebca90e0...21.3 KiB6.7 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: 852 ms
URLTime Spent
bath.ac.uk/852 ms
www.bath.ac.uk/0.0 ms

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.

Diagnostics

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: 240 ms 37.7 KiB
URLTransfer SizeEst Savings
www.bath.ac.uk/lens/125/css/university-of-bath/university-of-bath.css42.1 KiB37.7 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: 1.5 s 177.2 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtm.js?id=GTM-NN6ZCP209.2 KiB77.1 KiB
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js122.8 KiB55.5 KiB
/ajax/libs/material-components-web/5.1.0/material-compone...37.8 KiB23.1 KiB
cdnjs.cloudflare.com/ajax/libs/foundation/6.8.1/js/foundation.min.js31.9 KiB21.5 KiB

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 Evaluation902 ms
Other898 ms
Style & Layout371 ms
Script Parsing & Compilation199 ms
Rendering98 ms
Parse HTML & CSS59 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 that use WebXR are not currently eligible for back/forward cache.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
live.staticflickr.com/65535/52169322768_4eddba5e14_o_d.jpg721.3 KiB
/lens/125/assets/university-of-bath/images/awards/sport-u...431.0 KiB
/cdn-cgi/challenge-platform/h/b/flow/ov1/2461874605:17768...295.4 KiB
live.staticflickr.com/65535/54142194070_d1d1db656a_c_d.jpg288.6 KiB
/cdn-cgi/challenge-platform/h/b/flow/ov1/2461874605:17768...285.8 KiB
live.staticflickr.com/65535/52152154112_02ec5d565a_o_d.jpg280.5 KiB
/cdn-cgi/challenge-platform/h/b/flow/ov1/2461874605:17768...271.5 KiB
/cdn-cgi/challenge-platform/h/b/flow/ov1/2461874605:17768...271.4 KiB
live.staticflickr.com/65535/52153161661_e646a54c65_o_d.jpg266.6 KiB
live.staticflickr.com/65535/52152154212_cacc456265_o_d.jpg258.8 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
World top 150 university in the QS world university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-worl...
UK top 10 university in all 4 2026 UK university league tables div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/top-10-...
UK top 10 for careers and jobs in the Daily Mail and Guardian university guides… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/daily-m...
World top 100 for employer reputation in the QS World university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-empl...
World top 100 for sustainability in the QS World university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-sust...
2nd safest university town in England and Wales in the Complete University Guid… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/cug-2nd...
UK top 20 for student experience in the National Student Experience Survey Time… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/nss-stu...
World top 50 for social impact in the QS world university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-soci...
World top 150 university in the QS world university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-worl...
UK top 10 university in all 4 2026 UK university league tables div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/top-10-...
UK top 10 for careers and jobs in the Daily Mail and Guardian university guides… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/daily-m...
World top 100 for employer reputation in the QS World university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-empl...
World top 100 for sustainability in the QS World university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-sust...
2nd safest university town in England and Wales in the Complete University Guid… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/cug-2nd...
UK top 20 for student experience in the National Student Experience Survey Time… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/nss-stu...
World top 50 for social impact in the QS world university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-soci...
World top 150 university in the QS world university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-worl...
UK top 10 university in all 4 2026 UK university league tables div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/top-10-...
UK top 10 for careers and jobs in the Daily Mail and Guardian university guides… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/daily-m...
World top 100 for employer reputation in the QS World university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-empl...
World top 100 for sustainability in the QS World university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-sust...
2nd safest university town in England and Wales in the Complete University Guid… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/cug-2nd...
UK top 20 for student experience in the National Student Experience Survey Time… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/nss-stu...
World top 50 for social impact in the QS world university rankings 2026 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/qs-soci...
Sport university of the year in the Times and Sunday Times good university guid… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/sport-u...
Sport university of the year in the Times and Sunday Times good university guid… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/sport-u...
Sport university of the year in the Times and Sunday Times good university guid… div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/sport-u...
Triple gold award in the Teaching Excellence Framework 2023 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/TEF-tri...
Triple gold award in the Teaching Excellence Framework 2023 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/TEF-tri...
Triple gold award in the Teaching Excellence Framework 2023 div.award-slider > div.award-slider-track > div.award-slide > img
/lens/125/assets/university-of-bath/images/awards/TEF-tri...

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
●LCP breakdown
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●JavaScript execution time 1.0 s
●Avoid long main-thread tasks 7 long tasks found
●Avoid non-composited animations 1 animated element found
●Network Requests
●Network Round Trip Times 30 ms
●Server Backend Latencies 140 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 40 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○User Timing marks and measures
99

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.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Undergraduate prospectus 2027 div.flex-wrapper > article.dual-block-text > div.link-wrapper > h3.link-heading

These are opportunities to improve keyboard navigation in your application.

○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]`s are contained by their required parent element
●`[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
●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
●`<frame>` or `<iframe>` elements have a title
●`<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.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●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 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
○`<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.
○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.
○Identical links have the same purpose.
○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.
96

Best Practices

General

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
TypeError: a.querySelectorAll is not a function at p (<anonymous>:3:35) at <anonymous>:3:290 at NodeList.forEach (<anonymous>) at <anonymous>:3:270 at Array.forEach (<anonymous>) at MutationObserver.<anonymous> (<anonymous>:3:215)
TypeError: a.querySelectorAll is not a function at p (<anonymous>:3:35) at <anonymous>:3:290 at NodeList.forEach (<anonymous>) at <anonymous>:3:270 at Array.forEach (<anonymous>) at MutationObserver.<anonymous> (<anonymous>:3:215)
www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/in-page-nav.js line 268, col 42
TypeError: Cannot read properties of undefined (reading 'top') at https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/in-page-nav.js:269:43
cdnjs.cloudflare.com/ajax/libs/foundation/6.8.1/js/foundation.min.js
Uncaught ReferenceError: We're sorry, '_reset' is not an available method for this element.
●Uses HTTPS
●Avoids deprecated APIs
●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
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
100

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.

○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 have descriptive text
●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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