Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

Request	Cache TTL	Transfer Size
www.essex.ac.uk/assets/app/general/video/homepage.mp4	604800.0 s	4.1 MiB
prospect-guidance-ui.unibuddy.co/npm.unibuddy.2b7beede4b7f10caf22c.js	0.0 ms	211.8 KiB
/api/v1/gw/static/js/main.www_essex_ac_uk.ecItN.v93.js	3600.0 s	185.6 KiB
prospect-guidance-ui.unibuddy.co/npm.mixpanel-browser.2b7beede4b7f10caf22c.js	0.0 ms	89.8 KiB
/signals/config/162079440861037?v=2.9.303&r=stable&domain...	1200.0 s	97.9 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
prospect-guidance-ui.unibuddy.co/npm.sentry.2b7beede4b7f10caf22c.js	0.0 ms	81.6 KiB
/api/v1/gw/static/js/vendor.www_essex_ac_uk.ecItN.v93.js	3600.0 s	74.4 KiB
cdn-ukwest.onetrust.com/scripttemplates/202603.1.0/otBannerSdk.js	86400.0 s	129.9 KiB
prospect-guidance-ui.unibuddy.co/npm.react-dom.2b7beede4b7f10caf22c.js	0.0 ms	41.8 KiB
prospect-guidance-ui.unibuddy.co/npm.apollo.2b7beede4b7f10caf22c.js	0.0 ms	41.8 KiB
/signals/config/136433010283730?v=2.9.303&r=stable&domain...	1200.0 s	46.4 KiB
js.monitor.azure.com/scripts/b/ai.2.min.js	1800.0 s	46.2 KiB
prospect-guidance-ui.unibuddy.co/main.2b7beede4b7f10caf22c.js	0.0 ms	32.6 KiB
platform.twitter.com/widgets.js	1800.0 s	27.3 KiB
prospect-guidance-ui.unibuddy.co/npm.sentry-internal.2b7beede4b7f10caf22c.js	0.0 ms	22.9 KiB
www.essex.ac.uk/assets/dist/vendor.js?639080591030031900	604800.0 s	216.7 KiB
f.vimeocdn.com/p/4.46.43/js/player.module.js	1209600.0 s	211.5 KiB
/npm.launchdarkly-js-client-sdk.2b7beede4b7f10caf22c.js	0.0 ms	20.6 KiB
prospect-guidance-ui.unibuddy.co/npm.pusher-js.2b7beede4b7f10caf22c.js	0.0 ms	20.4 KiB
/signals/config/620895988379940?v=2.9.303&r=stable&domain...	1200.0 s	16.7 KiB
/signals/config/1181944207063915?v=2.9.303&r=stable&domai...	1200.0 s	16.3 KiB
prospect-guidance-ui.unibuddy.co/npm.yup.2b7beede4b7f10caf22c.js	0.0 ms	12.0 KiB
www.essex.ac.uk/assets/dist/app/general/img/textures/dark_06.jpg	604800.0 s	115.5 KiB
prospect-guidance-ui.unibuddy.co/npm.graphql.2b7beede4b7f10caf22c.js	0.0 ms	11.5 KiB
prospect-guidance-ui.unibuddy.co/npm.marked.2b7beede4b7f10caf22c.js	0.0 ms	11.4 KiB
f.vimeocdn.com/p/4.46.43/js/vendor.module.js	1209600.0 s	93.3 KiB
prospect-guidance-ui.unibuddy.co/npm.dompurify.2b7beede4b7f10caf22c.js	0.0 ms	8.7 KiB
www.essex.ac.uk/assets/app/general/img/fallbacks/home_video.jpg	604800.0 s	79.9 KiB
prospect-guidance-ui.unibuddy.co/npm.lodash-es.2b7beede4b7f10caf22c.js	0.0 ms	7.8 KiB
prospect-guidance-ui.unibuddy.co/npm.styled-components.2b7beede4b7f10caf22c.js	0.0 ms	7.8 KiB
player.vimeo.com/api/player.js	1800.0 s	9.0 KiB
tags.srv.stackadapt.com/events.js	5.0 s	7.7 KiB
prospect-guidance-ui.unibuddy.co/npm.hammerjs.2b7beede4b7f10caf22c.js	0.0 ms	7.6 KiB
prospect-guidance-ui.unibuddy.co/npm.formik.2b7beede4b7f10caf22c.js	0.0 ms	7.6 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
prospect-guidance-ui.unibuddy.co/npm.core-js.2b7beede4b7f10caf22c.js	0.0 ms	7.3 KiB
prospect-guidance-ui.unibuddy.co/npm.date-fns.2b7beede4b7f10caf22c.js	0.0 ms	6.5 KiB
prospect-guidance-ui.unibuddy.co/npm.emotion.2b7beede4b7f10caf22c.js	0.0 ms	6.3 KiB
www1.essex.ac.uk/scripts/sitecore/text-slider.js	0.0 ms	5.8 KiB
www.essex.ac.uk/assets/dist/app.js?639080591030031900	604800.0 s	53.7 KiB
www.gstatic.com/eureka/clank/146/cast_sender.js	86400.0 s	13.4 KiB
www.essex.ac.uk/assets/dist/app/general/img/textures/light_01.jpg	604800.0 s	53.4 KiB
www.essex.ac.uk/assets/dist/app.css?639080591030031900	604800.0 s	50.2 KiB
prospect-guidance-ui.unibuddy.co/npm.uuid.2b7beede4b7f10caf22c.js	0.0 ms	4.7 KiB
prospect-guidance-ui.unibuddy.co/npm.react-linkify.2b7beede4b7f10caf22c.js	0.0 ms	4.6 KiB
prospect-guidance-ui.unibuddy.co/npm.react-router-dom.2b7beede4b7f10caf22c.js	0.0 ms	4.6 KiB
prospect-guidance-ui.unibuddy.co/npm.history.2b7beede4b7f10caf22c.js	0.0 ms	3.8 KiB
acdn.adnxs.com/dmp/up/pixie.js	86402.0 s	9.2 KiB
/npm.intersection-observer.2b7beede4b7f10caf22c.js	0.0 ms	3.6 KiB
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
/npm.launchdarkly-react-client-sdk.2b7beede4b7f10caf22c.js	0.0 ms	3.4 KiB
prospect-guidance-ui.unibuddy.co/npm.react.2b7beede4b7f10caf22c.js	0.0 ms	3.3 KiB
prospect-guidance-ui.unibuddy.co/embed.js	0.0 ms	3.1 KiB
prospect-guidance-ui.unibuddy.co/npm.wry.2b7beede4b7f10caf22c.js	0.0 ms	3.1 KiB
prospect-guidance-ui.unibuddy.co/npm.zen-observable-ts.2b7beede4b7f10caf22c.js	0.0 ms	3.0 KiB
www.essex.ac.uk/assets/dist/archivo-regular.woff2	604800.0 s	29.7 KiB
www.essex.ac.uk/assets/dist/archivo-black.woff2	604800.0 s	27.7 KiB
prospect-guidance-ui.unibuddy.co/npm.lodash.camelcase.2b7beede4b7f10caf22c.js	0.0 ms	2.8 KiB
prospect-guidance-ui.unibuddy.co/npm.optimism.2b7beede4b7f10caf22c.js	0.0 ms	2.4 KiB
prospect-guidance-ui.unibuddy.co/npm.scheduler.2b7beede4b7f10caf22c.js	0.0 ms	2.4 KiB
f.vimeocdn.com/p/4.46.43/css/player.css	1209600.0 s	23.9 KiB
prospect-guidance-ui.unibuddy.co/npm.path-to-regexp.2b7beede4b7f10caf22c.js	0.0 ms	2.3 KiB
prospect-guidance-ui.unibuddy.co/npm.marked-footnote.2b7beede4b7f10caf22c.js	0.0 ms	2.2 KiB
/npm.react-textarea-autosize.2b7beede4b7f10caf22c.js	0.0 ms	2.2 KiB
prospect-guidance-ui.unibuddy.co/npm.tslib.2b7beede4b7f10caf22c.js	0.0 ms	2.0 KiB
prospect-guidance-ui.unibuddy.co/npm.style-loader.2b7beede4b7f10caf22c.js	0.0 ms	1.9 KiB
/npm.ub-feature-flagging-react.2b7beede4b7f10caf22c.js	0.0 ms	1.9 KiB
/api/v1/gw/static/js/index.www_essex_ac_uk.ecItN.v93.js	3600.0 s	2.2 KiB
prospect-guidance-ui.unibuddy.co/npm.uc.micro.2b7beede4b7f10caf22c.js	0.0 ms	1.8 KiB
prospect-guidance-ui.unibuddy.co/npm.graphql-tag.2b7beede4b7f10caf22c.js	0.0 ms	1.7 KiB
prospect-guidance-ui.unibuddy.co/runtime.2b7beede4b7f10caf22c.js	0.0 ms	1.6 KiB
/logos/ed6ee1eb-8ada-44d0-a1df-09ddf86cf19a/018dd60c-a5e7...	86400.0 s	3.9 KiB
prospect-guidance-ui.unibuddy.co/npm.react-is.2b7beede4b7f10caf22c.js	0.0 ms	1.5 KiB
prospect-guidance-ui.unibuddy.co/npm.property-expr.2b7beede4b7f10caf22c.js	0.0 ms	1.5 KiB
prospect-guidance-ui.unibuddy.co/npm.process.2b7beede4b7f10caf22c.js	0.0 ms	1.5 KiB
prospect-guidance-ui.unibuddy.co/npm.tiny-case.2b7beede4b7f10caf22c.js	0.0 ms	1.5 KiB
prospect-guidance-ui.unibuddy.co/npm.tiny-invariant.2b7beede4b7f10caf22c.js	0.0 ms	1.4 KiB
/npm.ub-feature-flagging-core.2b7beede4b7f10caf22c.js	0.0 ms	1.4 KiB
prospect-guidance-ui.unibuddy.co/npm.css-loader.2b7beede4b7f10caf22c.js	0.0 ms	1.4 KiB
prospect-guidance-ui.unibuddy.co/npm.use-latest.2b7beede4b7f10caf22c.js	0.0 ms	1.4 KiB
prospect-guidance-ui.unibuddy.co/npm.toposort.2b7beede4b7f10caf22c.js	0.0 ms	1.3 KiB
prospect-guidance-ui.unibuddy.co/npm.react-fast-compare.2b7beede4b7f10caf22c.js	0.0 ms	1.3 KiB
/npm.use-isomorphic-layout-effect.2b7beede4b7f10caf22c.js	0.0 ms	1.3 KiB
prospect-guidance-ui.unibuddy.co/npm.deepmerge.2b7beede4b7f10caf22c.js	0.0 ms	1.3 KiB
/npm.hoist-non-react-statics.2b7beede4b7f10caf22c.js	0.0 ms	1.3 KiB
prospect-guidance-ui.unibuddy.co/npm.tiny-warning.2b7beede4b7f10caf22c.js	0.0 ms	1.3 KiB
prospect-guidance-ui.unibuddy.co/npm.prop-types.2b7beede4b7f10caf22c.js	0.0 ms	1.3 KiB
prospect-guidance-ui.unibuddy.co/npm.babel.2b7beede4b7f10caf22c.js	0.0 ms	1.2 KiB
prospect-guidance-ui.unibuddy.co/npm.resolve-pathname.2b7beede4b7f10caf22c.js	0.0 ms	1.2 KiB
prospect-guidance-ui.unibuddy.co/npm.tlds.2b7beede4b7f10caf22c.js	0.0 ms	1.2 KiB
cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svg	86400.0 s	2.7 KiB
prospect-guidance-ui.unibuddy.co/npm.shallowequal.2b7beede4b7f10caf22c.js	0.0 ms	1.1 KiB
prospect-guidance-ui.unibuddy.co/npm.value-equal.2b7beede4b7f10caf22c.js	0.0 ms	1.1 KiB
prospect-guidance-ui.unibuddy.co/config.js	0.0 ms	1.0 KiB
prospect-guidance-ui.unibuddy.co/npm.rehackt.2b7beede4b7f10caf22c.js	0.0 ms	1010 B
prospect-guidance-ui.unibuddy.co/npm.use-composed-ref.2b7beede4b7f10caf22c.js	0.0 ms	1005 B
www.essex.ac.uk/assets/dist/app/components/footer/img/bg.jpg	604800.0 s	9.6 KiB
/collect?v=2&fmt=js&pid=7043449&time=1776897093106&url=ht...	0.0 ms	694 B
www.essex.ac.uk/assets/dist/0.1eb5c305354f606abd2a.js	604800.0 s	4.8 KiB
/config/uk/ca7e12bb-e4d6-48c6-9556-6978d5e1fb02.js?v=3.56...	0.0 ms	454 B
/config/uk/81e5a60d-93c2-4dcc-8720-55e6f5b0f663.js?v=3.56...	0.0 ms	256 B
www.essex.ac.uk/layouts/system/VisitorIdentification.js	604800.0 s	1.6 KiB
/tr/?id=136433010283730&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	18 B
/tr/?id=162079440861037&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	16 B
/tr/?id=1181944207063915&ev=PageView&dl=https%3A%2F%2Fwww...	0.0 ms	16 B
/tr/?id=620895988379940&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	16 B
f.vimeocdn.com/p/4.46.43/js/player.module.js	1209600.0 s	0 B
prospect-guidance-ui.unibuddy.co/npm.unibuddy.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.unibuddy.2b7beede4b7f10caf22c.js	0.0 ms	0 B
f.vimeocdn.com/p/4.46.43/js/vendor.module.js	1209600.0 s	0 B
prospect-guidance-ui.unibuddy.co/npm.mixpanel-browser.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.mixpanel-browser.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.sentry.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.sentry.2b7beede4b7f10caf22c.js	0.0 ms	0 B
f.vimeocdn.com/p/4.46.43/css/player.css	1209600.0 s	0 B
prospect-guidance-ui.unibuddy.co/main.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/main.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.apollo.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.apollo.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.react-dom.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.react-dom.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.pusher-js.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.pusher-js.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.sentry-internal.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.sentry-internal.2b7beede4b7f10caf22c.js	0.0 ms	0 B
/npm.launchdarkly-js-client-sdk.2b7beede4b7f10caf22c.js	0.0 ms	0 B
/npm.launchdarkly-js-client-sdk.2b7beede4b7f10caf22c.js	0.0 ms	0 B
www.gstatic.com/eureka/clank/146/cast_sender.js	86400.0 s	0 B
prospect-guidance-ui.unibuddy.co/npm.graphql.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.graphql.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.yup.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.yup.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.marked.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.marked.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.formik.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.formik.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.date-fns.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.date-fns.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.lodash-es.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.lodash-es.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.dompurify.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.dompurify.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.hammerjs.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.hammerjs.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.styled-components.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.styled-components.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.core-js.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.core-js.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.emotion.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.emotion.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.uuid.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.uuid.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.react-router-dom.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.react-router-dom.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.react-linkify.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.react-linkify.2b7beede4b7f10caf22c.js	0.0 ms	0 B
/npm.intersection-observer.2b7beede4b7f10caf22c.js	0.0 ms	0 B
/npm.intersection-observer.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.history.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.history.2b7beede4b7f10caf22c.js	0.0 ms	0 B
/npm.launchdarkly-react-client-sdk.2b7beede4b7f10caf22c.js	0.0 ms	0 B
/npm.launchdarkly-react-client-sdk.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.zen-observable-ts.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.zen-observable-ts.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.wry.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.wry.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.react.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.react.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.optimism.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.optimism.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.lodash.camelcase.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.lodash.camelcase.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.scheduler.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.scheduler.2b7beede4b7f10caf22c.js	0.0 ms	0 B
prospect-guidance-ui.unibuddy.co/npm.path-to-regexp.2b7beede4b7f10caf22c.js	0.0 ms	0 B
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prospect-guidance-ui.unibuddy.co/npm.graphql-tag.2b7beede4b7f10caf22c.js	0.0 ms	0 B
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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.

URL	Est Savings
www.essex.ac.uk/assets/dist/archivo-regular.woff2	45 ms
www.essex.ac.uk/assets/dist/archivo-black.woff2	30 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:16.797 source:map[column:101058 line:1 type:source-location url:https://www.essex.ac.uk/assets/dist/app.js?639080591030031900 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:112.739 source:map[type:text value:[unattributed]]] map[reflowTime:1.682 source:map[column:37904 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/app.js?639080591030031900 urlProvider:network]] map[reflowTime:1.833 source:map[column:64121 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/vendor.js?639080591030031900 urlProvider:network]] map[reflowTime:0.384 source:map[column:64207 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/vendor.js?639080591030031900 urlProvider:network]] map[reflowTime:0.265 source:map[column:67495 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/app.js?639080591030031900 urlProvider:network]] map[reflowTime:1.041 source:map[column:103828 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/app.js?639080591030031900 urlProvider:network]] map[reflowTime:4.252 source:map[column:24309 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/app.js?639080591030031900 urlProvider:network]] map[reflowTime:2.949 source:map[column:809 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/app.js?639080591030031900 urlProvider:network]] map[reflowTime:1.238 source:map[column:10449 line:7 type:source-location url:https://platform.twitter.com/widgets.js urlProvider:network]] map[reflowTime:0.202 source:map[column:36 line:151 type:source-location url:https://www1.essex.ac.uk/scripts/sitecore/text-slider.js urlProvider:network]] map[reflowTime:0.842 source:map[column:11721 line:1 type:source-location url:https://eu.gw.fortiabp.forticloud.com/api/v1/gw/static/js/vendor.www_essex_ac_uk.ecItN.v93.js urlProvider:network]] map[reflowTime:16.797 source:map[column:101260 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/app.js?639080591030031900 urlProvider:network]] map[reflowTime:9.533 source:map[column:10381 line:1 type:source-location url:https://eu.gw.fortiabp.forticloud.com/api/v1/gw/static/js/vendor.www_essex_ac_uk.ecItN.v93.js urlProvider:network]] map[reflowTime:0.558 source:map[column:11994 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/0.1eb5c305354f606abd2a.js urlProvider:network]] map[reflowTime:0.215 source:map[column:15769 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/0.1eb5c305354f606abd2a.js urlProvider:network]] map[reflowTime:0.748 source:map[column:20619 line:1 type:source-location url:https://eu.gw.fortiabp.forticloud.com/api/v1/gw/static/js/vendor.www_essex_ac_uk.ecItN.v93.js urlProvider:network]] map[reflowTime:6.177 source:map[column:303154 line:6 type:source-location url:https://cdn-ukwest.onetrust.com/scripttemplates/202603.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:0.516 source:map[column:357854 line:6 type:source-location url:https://cdn-ukwest.onetrust.com/scripttemplates/202603.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:0.268 source:map[column:562096 line:0 type:source-location url:https://www.essex.ac.uk/assets/dist/vendor.js?639080591030031900 urlProvider:network]] map[reflowTime:0.226 source:map[column:45940 line:1 type:source-location url:https://sc-static.net/scevent.min.js urlProvider:network]]]

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.

	URL	Resource Size	Est Savings
	/-/media/header-images/accommodation/the-copse-accommodat...	415.4 KiB	340.0 KiB
Your course, Your people, Your future `div.video > div.video__thumbnail-wrapper > div.video__thumbnail-img > img.js-video-thumbnail`	www.essex.ac.uk/-/media/images/welcome/freshers-colchester-welcome-week.jpg	115.2 KiB	74.9 KiB
View of the Silberrad Student Centre from across the lake. Image has been heavi… `div.home > div.home-header > div.home-header__video-wrapper > video.js-home-header-video`	www.essex.ac.uk/-/media/homepage/home_video.jpg	121.1 KiB	21.1 KiB
University of Essex June Open Day `div.promo-with-background > div.promo-with-background__container > div.promo-with-background__image-container > img.promo-with-background__image`	/-/media/images/homepage/university-open-day.jpg?h=500&w=...	30.1 KiB	14.7 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:1363.42 label:Time to first byte subpart:timeToFirstByte] map[duration:27.14 label:Resource load delay subpart:resourceLoadDelay] map[duration:179.315 label:Resource load duration subpart:resourceLoadDuration] map[duration:1175.142 label:Element render delay subpart:elementRenderDelay]]

lhId: page-1-VIDEO

nodeLabel: View of the Silberrad Student Centre from across the lake. Image has been heavi…

path: 1,HTML,1,BODY,4,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,VIDEO

selector: div.home > div.home-header > div.home-header__video-wrapper > video.js-home-header-video

snippet: <video poster="/-/media/homepage/home_video.jpg" autoplay="autoplay" loop="loop" playsinline="" muted="muted" class="js-home-header-video home-header__video" style="background-image: url("/assets/app/general/img/fallbacks/home_video.jpg");">

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-1-VIDEO

nodeLabel: View of the Silberrad Student Centre from across the lake. Image has been heavi…

path: 1,HTML,1,BODY,4,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,VIDEO

selector: div.home > div.home-header > div.home-header__video-wrapper > video.js-home-header-video

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.

URL	Protocol
www.essex.ac.uk/	http/1.1
www.essex.ac.uk/layouts/system/VisitorIdentification.js	http/1.1
www.essex.ac.uk/assets/dist/app.css?639080591030031900	http/1.1
www.essex.ac.uk/-/media/homepage/home_video.jpg	http/1.1
/-/media/header-images/accommodation/the-copse-accommodat...	http/1.1
/-/media/images/homepage/university-open-day.jpg?h=500&w=...	http/1.1
www.essex.ac.uk/-/media/images/welcome/freshers-colchester-welcome-week.jpg	http/1.1
www.essex.ac.uk/assets/dist/vendor.js?639080591030031900	http/1.1
www.essex.ac.uk/assets/dist/app.js?639080591030031900	http/1.1
www.essex.ac.uk/assets/app/general/img/favicons/manifest.json	http/1.1
www.essex.ac.uk/assets/app/general/video/homepage.mp4	http/1.1
www.essex.ac.uk/assets/app/general/img/fallbacks/home_video.jpg	http/1.1
www.essex.ac.uk/assets/dist/app/general/img/textures/dark_06.jpg	http/1.1
www.essex.ac.uk/assets/dist/archivo-black.woff2	http/1.1
www.essex.ac.uk/assets/dist/archivo-regular.woff2	http/1.1
www.essex.ac.uk/assets/dist/app/components/footer/img/bg.jpg	http/1.1
www.essex.ac.uk/assets/dist/app/general/img/textures/light_01.jpg	http/1.1
www.essex.ac.uk/assets/dist/0.1eb5c305354f606abd2a.js	http/1.1
www.essex.ac.uk/assets/app/general/img/favicons/favicon-32x32.png	http/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.

URL	Transfer Size	Duration
www.essex.ac.uk/assets/dist/app.css?639080591030031900	50.2 KiB	677 ms
www.essex.ac.uk/layouts/system/VisitorIdentification.js	1.6 KiB	519 ms
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	9.1 KiB	768 ms

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: 778 ms

URL	Time Spent
essex.ac.uk/	778 ms
www.essex.ac.uk/	0.0 ms

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: 470 ms 67.0 KiB

URL	Transfer Size	Est Savings
www.essex.ac.uk/assets/dist/app.css?639080591030031900	49.7 KiB	47.5 KiB
	22.2 KiB	19.5 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: 1.4 s 1.1 MiB

URL	Transfer Size	Est Savings
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	290.5 KiB	194.2 KiB
www.essex.ac.uk/assets/dist/vendor.js?639080591030031900	216.2 KiB	146.4 KiB
cdn-ukwest.onetrust.com/scripttemplates/202603.1.0/otBannerSdk.js	129.7 KiB	70.1 KiB
www.googletagmanager.com/gtag/js?id=AW-16995341908&cx=c&gtm=4e64k1	143.4 KiB	65.2 KiB
www.googletagmanager.com/gtag/js?id=AW-922787666&cx=c&gtm=4e64k1	144.3 KiB	65.2 KiB
www.googletagmanager.com/gtag/js?id=AW-10838982605&cx=c&gtm=4e64k1	177.0 KiB	63.0 KiB
www.googletagmanager.com/gtag/js?id=DC-15336102&cx=c&gtm=4e64k1	130.6 KiB	61.5 KiB
www.googletagmanager.com/gtag/js?id=AW-372926741&cx=c&gtm=4e64k1	144.5 KiB	60.8 KiB
www.googletagmanager.com/gtag/js?id=G-06D5HQ8SFG&cx=c&gtm=4e64k1	173.5 KiB	60.7 KiB
/api/v1/gw/static/js/main.www_essex_ac_uk.ecItN.v93.js	185.5 KiB	60.4 KiB
www.googletagmanager.com/gtag/js?id=DC-9360105&cx=c&gtm=4e64k1	130.6 KiB	59.5 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js	109.0 KiB	56.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-W9QBMC	195.0 KiB	51.6 KiB
/api/v1/gw/static/js/vendor.www_essex_ac_uk.ecItN.v93.js	74.2 KiB	35.9 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	32.3 KiB
www.essex.ac.uk/assets/dist/app.js?639080591030031900	53.2 KiB	27.1 KiB
/signals/config/162079440861037?v=2.9.303&r=stable&domain...	97.8 KiB	23.9 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.

URL	Total CPU Time	Script Evaluation	Script Parse
www.essex.ac.uk/	4.5 s	43 ms	13 ms
Unattributable	3.4 s	613 ms	0.0 ms
/api/v1/gw/static/js/vendor.www_essex_ac_uk.ecItN.v93.js	2.4 s	1.6 s	2.0 ms
www.essex.ac.uk/assets/dist/app.js?639080591030031900	1.8 s	1.4 s	59 ms
www.googletagmanager.com/gtm.js?id=GTM-W9QBMC	1.5 s	1.2 s	226 ms
www.googletagmanager.com/gtag/js?id=AW-10838982605&cx=c&gtm=4e64k1	1.5 s	1.3 s	173 ms
/api/v1/gw/static/js/main.www_essex_ac_uk.ecItN.v93.js	1.3 s	1.1 s	2.8 ms
www.essex.ac.uk/assets/dist/vendor.js?639080591030031900	764 ms	94 ms	217 ms
/signals/config/162079440861037?v=2.9.303&r=stable&domain...	704 ms	511 ms	51 ms
www.googletagmanager.com/gtag/js?id=G-06D5HQ8SFG&cx=c&gtm=4e64k1	580 ms	485 ms	88 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js	516 ms	341 ms	78 ms
sc-static.net/scevent.min.js	509 ms	425 ms	10 ms
cdn-ukwest.onetrust.com/scripttemplates/202603.1.0/otBannerSdk.js	453 ms	279 ms	113 ms
www.googletagmanager.com/gtag/js?id=AW-372926741&cx=c&gtm=4e64k1	394 ms	304 ms	86 ms
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	389 ms	176 ms	212 ms
www.googletagmanager.com/gtag/js?id=AW-16995341908&cx=c&gtm=4e64k1	350 ms	239 ms	108 ms
www.googletagmanager.com/gtag/js?id=DC-9360105&cx=c&gtm=4e64k1	331 ms	227 ms	61 ms
www.googletagmanager.com/gtag/js?id=DC-15336102&cx=c&gtm=4e64k1	323 ms	238 ms	64 ms
js.monitor.azure.com/scripts/b/ai.2.min.js	315 ms	254 ms	22 ms
connect.facebook.net/en_US/fbevents.js	310 ms	244 ms	63 ms
www.googletagmanager.com/gtag/js?id=AW-922787666&cx=c&gtm=4e64k1	300 ms	221 ms	76 ms
prospect-guidance-ui.unibuddy.co/embed.js	281 ms	275 ms	2.2 ms
/signals/config/136433010283730?v=2.9.303&r=stable&domain...	261 ms	214 ms	43 ms
platform.twitter.com/widgets.js	238 ms	186 ms	45 ms
www.essex.ac.uk/assets/dist/0.1eb5c305354f606abd2a.js	195 ms	83 ms	2.8 ms
tags.srv.stackadapt.com/events.js	159 ms	141 ms	3.8 ms
www.googleadservices.com/pagead/conversion.js	146 ms	111 ms	35 ms
player.vimeo.com/api/player.js	121 ms	54 ms	4.4 ms
static.ads-twitter.com/uwt.js	100 ms	76 ms	8.8 ms
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	98 ms	50 ms	5.7 ms
analytics.tiktok.com/i18n/pixel/static/identify_5cff1caf.js	89 ms	61 ms	28 ms
/signals/config/1181944207063915?v=2.9.303&r=stable&domai...	84 ms	64 ms	13 ms
/signals/config/620895988379940?v=2.9.303&r=stable&domain...	81 ms	61 ms	17 ms
snap.licdn.com/li.lms-analytics/insight.min.js	77 ms	68 ms	8.3 ms
/config/uk/81e5a60d-93c2-4dcc-8720-55e6f5b0f663.js?v=3.56...	53 ms	51 ms	0.6 ms
acdn.adnxs.com/dmp/up/pixie.js	53 ms	42 ms	4.4 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.

Category	Time Spent
Script Evaluation	13.0 s
Other	5.7 s
Style & Layout	2.2 s
Script Parsing & Compilation	2.0 s
Rendering	1.0 s
Garbage Collection	730 ms
Parse HTML & CSS	328 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 reason	Failure type
The page has an unload handler in the main frame.	Actionable
Pages with cache-control:no-store header cannot enter back/forward cache.	Actionable
The page has an unload handler in a sub frame.	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.

URL	Transfer Size
www.essex.ac.uk/assets/app/general/video/homepage.mp4	4.1 MiB
/-/media/header-images/accommodation/the-copse-accommodat...	415.9 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	362.4 KiB
www.essex.ac.uk/assets/dist/vendor.js?639080591030031900	216.7 KiB
prospect-guidance-ui.unibuddy.co/npm.unibuddy.2b7beede4b7f10caf22c.js	211.8 KiB
f.vimeocdn.com/p/4.46.43/js/player.module.js	211.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-W9QBMC	195.3 KiB
/api/v1/gw/static/js/main.www_essex_ac_uk.ecItN.v93.js	185.6 KiB
www.googletagmanager.com/gtag/js?id=AW-10838982605&cx=c&gtm=4e64k1	177.1 KiB
www.googletagmanager.com/gtag/js?id=G-06D5HQ8SFG&cx=c&gtm=4e64k1	173.5 KiB

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

●Layout shift culprits

●Optimize DOM size

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 16 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`

●Network Requests

●Network Round Trip Times 150 ms

●Server Backend Latencies 630 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 430 ms

●Avoid large layout shifts 9 layout shifts found

○INP breakdown

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.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

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
General - enquiries@essex.ac.uk `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Undergraduate - admit@essex.ac.uk `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Postgraduate - pgadmit@essex.ac.uk `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Disclaimer `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Accessibility `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Manage communication preferences `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Our privacy statements `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Making a complaint `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Our transparency return `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`
Modern slavery and human trafficking `div.footer__contact-column > ul.footer__contact-list > li.footer__contact-item > a`

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Privacy notice and use of cookies policy `div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a.ot-cookie-policy-link`

○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

●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.

●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

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●`<video>` elements contain a `<track>` element with `[kind="captions"]`

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements 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

○`<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

○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.

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 / Warning	Source
Unload event listeners are deprecated and will be removed.	/api/v1/gw/static/js/main.www_essex_ac_uk.ecItN.v93.js
AttributionReporting	snap.licdn.com/li.lms-analytics/insight.min.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.

Source	Description
www.essex.ac.uk/assets/app/general/img/favicons/manifest.json	`Failed to load resource: the server responded with a status of 404 (Not Found)`
www.essex.ac.uk/assets/app/general/img/favicons/manifest.json	`Failed to load resource: the server responded with a status of 404 (Not Found)`
www.essex.ac.uk/	`Manifest fetch from https://www.essex.ac.uk/assets/app/general/img/favicons/manifest.json failed, code 404`
www.essex.ac.uk/ line 1783, col 0	`Manifest fetch from https://www.essex.ac.uk/assets/app/general/img/favicons/manifest.json failed, code 404`

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	Map URL
www.essex.ac.uk/assets/dist/vendor.js?639080591030031900
js.monitor.azure.com/scripts/b/ai.2.min.js	js.monitor.azure.com/scripts/b/ai.2.8.18.min.js.map

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

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

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`
div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img `div.featured-links__wrapper > div.featured-links__img-wrapper > picture > img.featured-links__img`

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 have descriptive text

●Links are crawlable

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○robots.txt is valid