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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.

33

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

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
www.ens.psl.eu/themes/ens/video/ENS_slider_fr.mp41209600.0 s1.9 MiB
/sites/default/files/styles/actu_list/public/2026-03/sr.p...1209600.0 s332.9 KiB
platform.twitter.com/widgets.js1800.0 s27.3 KiB
stats-web.ens.psl.eu/matomo.js0.0 ms21.8 KiB
/sites/default/files/styles/home_header/public/2021-09/co...1209600.0 s185.4 KiB
/sites/default/files/styles/portrait/public/actu_vincent_...1209600.0 s156.8 KiB
/sites/default/files/styles/portrait/public/actu_wendelin...1209600.0 s138.1 KiB
/sites/default/files/styles/portrait/public/actu_fanny_ka...1209600.0 s101.9 KiB
/sites/default/files/styles/portrait/public/actu_alice_gu...1209600.0 s101.4 KiB
www.ens.psl.eu/themes/ens/images/ENS-bandeau-violet.jpg1209600.0 s100.9 KiB
/sites/default/files/styles/home_header/public/2026-01/ho...1209600.0 s90.5 KiB
www.ens.psl.eu/themes/ens/images/footer_bg.jpg1209600.0 s58.0 KiB
/sites/default/files/styles/camp_block_type_2/public/2025...1209600.0 s45.1 KiB
/sites/default/files/styles/home_header/public/2026-02/ho...1209600.0 s43.1 KiB
/sites/default/files/styles/camp_block_type_1/public/2019...1209600.0 s40.4 KiB
/sites/default/files/styles/camp_block_type_1/public/2021...1209600.0 s30.1 KiB
www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.11209600.0 s29.7 KiB
/sites/default/files/styles/actu_list/public/2026-04/juli...1209600.0 s29.0 KiB
www.ens.psl.eu/themes/ens/images/bibliotuque_logo.jpg1209600.0 s24.9 KiB
/sites/default/files/styles/camp_block_type_3/public/2021...1209600.0 s24.6 KiB
www.ens.psl.eu/themes/ens/js/jquery-ui.js?v=1.x1209600.0 s20.4 KiB
www.ens.psl.eu/themes/ens/css/style.css?tbsiin1209600.0 s18.2 KiB
www.ens.psl.eu/themes/ens/images/edition_logo.jpg1209600.0 s17.2 KiB
/sites/default/files/styles/image_evenement/public/2021-0...1209600.0 s16.5 KiB
/sites/default/files/styles/portrait/public/inline-images...1209600.0 s15.3 KiB
/sites/default/files/styles/portrait/public/2020-09/esthe...1209600.0 s14.5 KiB
www.ens.psl.eu/sites/default/files/inline-images/logo.jpg1209600.0 s14.4 KiB
/sites/default/files/styles/portrait/public/suzor-weiner_...1209600.0 s14.1 KiB
/sites/default/files/styles/portrait/public/actu_claire_z...1209600.0 s13.9 KiB
/sites/default/files/styles/portrait/public/marie-darieus...1209600.0 s13.6 KiB
/sites/default/files/styles/portrait/public/2019-01/norma...1209600.0 s12.9 KiB
www.ens.psl.eu/themes/ens/js/jquery.mCustomScrollbar.concat.min.js?v=1.x1209600.0 s12.7 KiB
/sites/default/files/styles/portrait/public/Bill_MG_5252 ...1209600.0 s12.5 KiB
/sites/default/files/styles/portrait/public/aime-cesaire-...1209600.0 s12.2 KiB
/sites/default/files/styles/portrait/public/simone-weil-2...1209600.0 s12.1 KiB
www.ens.psl.eu/themes/ens/images/alumni_logo.jpg1209600.0 s12.1 KiB
/sites/default/files/styles/portrait/public/actu_sylvia_s...1209600.0 s11.9 KiB
/sites/default/files/styles/portrait/public/2023-03/assia...1209600.0 s11.7 KiB
/sites/default/files/styles/portrait/public/debray_old.jp...1209600.0 s11.4 KiB
/sites/default/files/styles/portrait/public/Stanislas_Deh...1209600.0 s11.4 KiB
/sites/default/files/styles/portrait/public/souleymane_ba...1209600.0 s11.3 KiB
/sites/default/files/styles/portrait/public/2024-01/const...1209600.0 s11.2 KiB
/sites/default/files/styles/portrait/public/2020-06/miche...1209600.0 s11.0 KiB
/sites/default/files/styles/portrait/public/actu_frederic...1209600.0 s11.0 KiB
/sites/default/files/styles/portrait/public/2020-09/emman...1209600.0 s10.7 KiB
/sites/default/files/styles/portrait/public/lyderic_0.jpg...1209600.0 s10.6 KiB
/sites/default/files/styles/portrait/public/2016-12/actu_...1209600.0 s10.3 KiB
/sites/default/files/styles/portrait/public/2024-07/franc...1209600.0 s10.3 KiB
/sites/default/files/styles/portrait/public/Tristan_Garci...1209600.0 s10.3 KiB
/sites/default/files/styles/portrait/public/portrait-Past...1209600.0 s10.3 KiB
/sites/default/files/styles/portrait/public/2024-04/gille...1209600.0 s10.2 KiB
/sites/default/files/styles/portrait/public/Nali_Ananthar...1209600.0 s9.8 KiB
www.ens.psl.eu/themes/ens/images/psl_logo.jpg1209600.0 s9.6 KiB
/sites/default/files/styles/portrait/public/Amelie Tchern...1209600.0 s8.0 KiB
/sites/default/files/styles/camp_block_type_3/public/2021...1209600.0 s7.5 KiB
/sites/default/files/styles/portrait/public/2021-06/jean_...1209600.0 s7.4 KiB
www.ens.psl.eu/core/assets/vendor/underscore/underscore-min.js?v=1.13.71209600.0 s7.4 KiB
www.ens.psl.eu/themes/ens/font/fontello.woff2?462257471209600.0 s7.1 KiB
www.ens.psl.eu/themes/ens/images/institut_ens.png1209600.0 s7.0 KiB
www.ens.psl.eu/themes/ens/js/masonry.js?v=1.x1209600.0 s6.9 KiB
www.ens.psl.eu/themes/ens/js/main.js?v=1.x1209600.0 s6.2 KiB
www.ens.psl.eu/core/misc/drupal.js?v=10.6.51209600.0 s6.1 KiB
/modules/contrib/eu_cookie_compliance/js/eu_cookie_compli...1209600.0 s5.8 KiB
www.ens.psl.eu/themes/ens/css/jquery.mCustomScrollbar.css?tbsiin1209600.0 s5.5 KiB
www.ens.psl.eu/themes/ens/css/responsive.css?tbsiin1209600.0 s5.4 KiB
www.ens.psl.eu/themes/ens/images/fondation_logo.jpg1209600.0 s5.3 KiB
/sites/default/files/languages/fr_T3DzjFe-7GrLMKiX0EBkcIx...1209600.0 s5.1 KiB
www.ens.psl.eu/themes/ens/js/jquery.bxslider.min.js?v=1.x1209600.0 s5.1 KiB
www.ens.psl.eu/themes/bootstrap/js/drupal.bootstrap.js?tbsiin1209600.0 s4.9 KiB
www.ens.psl.eu/themes/ens/images/savoirs_logo.jpg1209600.0 s4.8 KiB
www.ens.psl.eu/themes/ens/js/aos.js?v=1.x1209600.0 s4.5 KiB
static.hotjar.com/c/hotjar-2752696.js?sv=660.0 s429 B
www.ens.psl.eu/themes/ens/css/jquery-ui.css?tbsiin1209600.0 s4.1 KiB
www.ens.psl.eu/themes/bootstrap/js/attributes.js?tbsiin1209600.0 s2.8 KiB
www.ens.psl.eu/themes/ens/css/aos.css?tbsiin1209600.0 s2.2 KiB
www.ens.psl.eu/themes/bootstrap/js/popover.js?tbsiin1209600.0 s1.8 KiB
www.ens.psl.eu/core/assets/vendor/normalize-css/normalize.css?tbsiin1209600.0 s1.8 KiB
/modules/contrib/eu_cookie_compliance/css/eu_cookie_compl...1209600.0 s1.4 KiB
www.ens.psl.eu/themes/ens/js/scoopit.js?v=1.x1209600.0 s1.3 KiB
www.ens.psl.eu/themes/bootstrap/js/theme.js?tbsiin1209600.0 s1.3 KiB
www.ens.psl.eu/themes/ens/css/jquery.bxslider.css?tbsiin1209600.0 s1.2 KiB
www.ens.psl.eu/themes/ens/css/fontello.css?tbsiin1209600.0 s1.2 KiB
www.ens.psl.eu/themes/ens/css/fontello_3.css?tbsiin1209600.0 s953 B
www.ens.psl.eu/themes/ens/css/fontello_2.css?tbsiin1209600.0 s907 B
www.ens.psl.eu/core/assets/vendor/once/once.min.js?v=1.0.11209600.0 s758 B
www.ens.psl.eu/core/modules/system/css/components/hidden.module.css?tbsiin1209600.0 s712 B
www.ens.psl.eu/modules/contrib/matomo/js/matomo.js?tbsiin1209600.0 s706 B
www.ens.psl.eu/themes/bootstrap/js/tooltip.js?tbsiin1209600.0 s697 B
www.ens.psl.eu/themes/ens/js/liste.js?v=1.x1209600.0 s668 B
www.ens.psl.eu/themes/ens/css/burger.css?tbsiin1209600.0 s606 B
www.ens.psl.eu/core/misc/drupal.init.js?v=10.6.51209600.0 s551 B
www.ens.psl.eu/themes/ens/css/event_back.css?tbsiin1209600.0 s483 B
www.ens.psl.eu/themes/ens/css/loader.css?tbsiin1209600.0 s470 B
www.ens.psl.eu/core/misc/drupalSettingsLoader.js?v=10.6.51209600.0 s447 B
www.ens.psl.eu/sites/default/files/hotjar/hotjar.script.js?tbsiin1209600.0 s404 B
www.ens.psl.eu/core/modules/system/css/components/js.module.css?tbsiin1209600.0 s402 B
/core/modules/system/css/components/system-status-counter...1209600.0 s374 B
/core/modules/system/css/components/system-status-report-...1209600.0 s363 B
www.ens.psl.eu/core/modules/system/css/components/align.module.css?tbsiin1209600.0 s355 B
/core/modules/system/css/components/reset-appearance.modu...1209600.0 s288 B
/modules/contrib/social_media_links/css/social_media_link...1209600.0 s285 B
www.ens.psl.eu/core/modules/system/css/components/clearfix.module.css?tbsiin1209600.0 s279 B
www.ens.psl.eu/core/modules/views/css/views.module.css?tbsiin1209600.0 s272 B
www.ens.psl.eu/core/modules/system/css/components/tablesort.module.css?tbsiin1209600.0 s266 B
www.ens.psl.eu/themes/bootstrap/js/bootstrap-pre-init.js?tbsiin1209600.0 s238 B
/core/modules/system/css/components/system-status-report-...1209600.0 s231 B
/core/modules/system/css/components/container-inline.modu...1209600.0 s226 B
www.ens.psl.eu/core/modules/system/css/components/item-list.module.css?tbsiin1209600.0 s214 B
www.ens.psl.eu/core/modules/system/css/components/resize.module.css?tbsiin1209600.0 s213 B
www.ens.psl.eu/core/modules/system/css/components/details.module.css?tbsiin1209600.0 s178 B
/sites/default/files/asset_injector/css/fix_field_collect...1209600.0 s172 B
www.ens.psl.eu/core/modules/system/css/components/nowrap.module.css?tbsiin1209600.0 s161 B
www.ens.psl.eu/core/modules/system/css/components/fieldgroup.module.css?tbsiin1209600.0 s152 B
/core/modules/system/css/components/position-container.mo...1209600.0 s151 B
/sites/default/files/asset_injector/css/masquer_bloc_date...1209600.0 s121 B
www.ens.psl.eu/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tbsiin1209600.0 s108 B
/uploads/videos/diffusion/Bienvenue_a_ENS_modifs_avril_20...0.0 ms0 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:0.184726] map[node:map[boundingRect:map[bottom:4795 height:4652 left:0 right:412 top:143 width:412] lhId:page-13-MAIN nodeLabel:Bienvenue à Normale Sup ! Le mois Femmes et Filles de sciences de l'ENS De févr… path:1,HTML,1,BODY,1,DIV,1,DIV,4,MAIN selector:body.path-frontpage > div.dialog-off-canvas-main-canvas > div.layout-container > main.main-content-div snippet:<main role="main" class="main-content-div" style="border-top: 5px solid rgb(234, 172, 63);"> type:node] score:0.184726]]

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
fonts.gstatic.com/s/crimsontext/v19/wlppgwHKFkZgtmSR3NB0oRJX1C1GDNNQ9rJPfw.woff240 ms
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-brands-400.woff235 ms
fonts.gstatic.com/s/crimsontext/v19/wlppgwHKFkZgtmSR3NB0oRJXsCxGDNNQ9rJPfw.woff220 ms
/s/crimsontext/v19/wlprgwHKFkZgtmSR3NB0oRJfajCOD-NS_LVtfa...20 ms
fonts.gstatic.com/s/crimsontext/v19/wlp2gwHKFkZgtmSR3NB0oRJfbwhTIfFd3A.woff220 ms
www.ens.psl.eu/themes/ens/font/fontello.woff2?4622574720 ms
/npm/entreprise7pro-bootstrap@3.4.8/dist/fonts/glyphicons...15 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:58.593 source:map[column:27323 line:2 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 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:173.23 source:map[column:10449 line:7 type:source-location url:https://platform.twitter.com/widgets.js urlProvider:network]] map[reflowTime:32.456 source:map[column:79427 line:1 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.908 source:map[column:50335 line:1 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.479 source:map[column:50393 line:1 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.929 source:map[column:50457 line:1 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:53.148 source:map[column:49615 line:1 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.174 source:map[column:54434 line:1 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.68 source:map[column:49637 line:1 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.516 source:map[column:51395 line:1 type:source-location url:https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:7.507 source:map[column:12949 line:0 type:source-location url:https://www.ens.psl.eu/themes/ens/js/aos.js?v=1.x 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.

URLResource SizeEst Savings
Sidonie Rosset div.views_rows > a.actu_element > div.visuel > img.img-responsive
/sites/default/files/styles/actu_list/public/2026-03/sr.p...332.6 KiB303.0 KiB
Photographe div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_vincent_...156.7 KiB144.4 KiB
Bienvenue à Normale Sup div.bl_video > div.item > a.show_video > img
/sites/default/files/styles/home_header/public/2021-09/co...185.2 KiB140.1 KiB
Mathématicien div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_wendelin...137.9 KiB125.6 KiB
Mathématicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_fanny_ka...101.8 KiB89.6 KiB
Mathématicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_alice_gu...101.2 KiB89.0 KiB
Petites exploratrices, petits explorateurs de la connaissance div.bl_video > div.item > a > img
/sites/default/files/styles/home_header/public/2026-01/ho...90.4 KiB80.8 KiB
Femmes et Filles de sciences de l'ENS div.bl_video > div.item > a > img
/sites/default/files/styles/home_header/public/2026-02/ho...43.0 KiB38.5 KiB
15 Départements Accéder à la fiche du département Centre interdisciplinaire sur… div#block-ens-content > div.region > div.home_page > div.taxo_block
www.ens.psl.eu/themes/ens/images/ENS-bandeau-violet.jpg100.8 KiB22.4 KiB
La plaquette de l'association des élèves de l'ENS-PSL div.hidden_block > div.vie_campus > div.bl_r > a.camp_block
/sites/default/files/styles/camp_block_type_2/public/2025...45.1 KiB10.6 KiB
ENS div.field > p > a > img
www.ens.psl.eu/sites/default/files/inline-images/logo.jpg14.4 KiB9.3 KiB
Téléchargez le livret de l'étudiant PSL div.hidden_block > div.vie_campus > div.bl_r > a.camp_block
/sites/default/files/styles/camp_block_type_3/public/2021...24.5 KiB7.6 KiB
Découvrez les campus div.hidden_block > div.vie_campus > div.bl_l > a.camp_block
/sites/default/files/styles/camp_block_type_1/public/2019...40.3 KiB5.5 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:175.643 label:Time to first byte subpart:timeToFirstByte] map[duration:32.367 label:Resource load delay subpart:resourceLoadDelay] map[duration:3042.088 label:Resource load duration subpart:resourceLoadDuration] map[duration:1138.229 label:Element render delay subpart:elementRenderDelay]]
lhId: page-2-IMG
nodeLabel: Bienvenue à Normale Sup
path: 1,HTML,1,BODY,1,DIV,1,DIV,4,MAIN,1,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,A,0,IMG
selector: div.bl_video > div.item > a.show_video > img
snippet: <img src="/sites/default/files/styles/home_header/public/2021-09/courernest_1_0.jpg?…" alt="Bienvenue à Normale Sup">

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-2-IMG
nodeLabel: Bienvenue à Normale Sup
path: 1,HTML,1,BODY,1,DIV,1,DIV,4,MAIN,1,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,A,0,IMG
selector: div.bl_video > div.item > a.show_video > img
snippet: <img src="/sites/default/files/styles/home_header/public/2021-09/courernest_1_0.jpg?…" alt="Bienvenue à Normale Sup">

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.ens.psl.eu/themes/ens/css/fontello_3.css?tbsiin953 B164 ms
www.ens.psl.eu/themes/ens/css/fontello.css?tbsiin1.2 KiB
/sites/default/files/asset_injector/css/fix_field_collect...172 B
www.ens.psl.eu/sites/default/files/hotjar/hotjar.script.js?tbsiin404 B164 ms
www.ens.psl.eu/themes/ens/css/event_back.css?tbsiin483 B
fonts.googleapis.com/css2?family=Karla:wght@400;700;800&display=swap527 B151 ms
fonts.googleapis.com/css?family=Crimson+Text:400,600,600i,7001.0 KiB783 ms
www.ens.psl.eu/themes/ens/css/style.css?tbsiin18.2 KiB981 ms
www.ens.psl.eu/themes/ens/css/jquery.mCustomScrollbar.css?tbsiin5.5 KiB164 ms
www.ens.psl.eu/themes/ens/css/aos.css?tbsiin2.2 KiB164 ms
/sites/default/files/asset_injector/css/masquer_bloc_date...121 B
www.ens.psl.eu/themes/ens/css/jquery-ui.css?tbsiin4.1 KiB164 ms
www.ens.psl.eu/themes/ens/css/loader.css?tbsiin470 B
www.ens.psl.eu/themes/ens/css/responsive.css?tbsiin5.4 KiB491 ms
www.ens.psl.eu/themes/ens/css/burger.css?tbsiin606 B
www.ens.psl.eu/core/modules/views/css/views.module.css?tbsiin272 B
www.ens.psl.eu/core/modules/system/css/components/tablesort.module.css?tbsiin266 B
/modules/contrib/social_media_links/css/social_media_link...285 B
www.ens.psl.eu/themes/ens/css/fontello_2.css?tbsiin907 B
www.ens.psl.eu/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tbsiin108 B
/modules/contrib/eu_cookie_compliance/css/eu_cookie_compl...1.4 KiB
www.ens.psl.eu/themes/ens/css/jquery.bxslider.css?tbsiin1.2 KiB
/core/modules/system/css/components/system-status-report-...231 B
/core/modules/system/css/components/system-status-counter...374 B164 ms
/core/modules/system/css/components/system-status-report-...363 B
www.ens.psl.eu/core/modules/system/css/components/resize.module.css?tbsiin213 B
/core/modules/system/css/components/position-container.mo...151 B
/core/modules/system/css/components/reset-appearance.modu...288 B
/npm/@unicorn-fail/drupal-bootstrap-styles@0.0.2/dist/3.4...3.9 KiB150 ms
/npm/@unicorn-fail/drupal-bootstrap-styles@0.0.2/dist/3.3...4.4 KiB150 ms
www.ens.psl.eu/core/modules/system/css/components/nowrap.module.css?tbsiin161 B
www.ens.psl.eu/core/modules/system/css/components/js.module.css?tbsiin402 B
/npm/@unicorn-fail/drupal-bootstrap-styles@0.0.2/dist/3.1...4.1 KiB150 ms
cdn.jsdelivr.net/npm/entreprise7pro-bootstrap@3.4.8/dist/css/bootstrap.css22.0 KiB1.5 s
www.ens.psl.eu/core/assets/vendor/normalize-css/normalize.css?tbsiin1.8 KiB
www.ens.psl.eu/core/modules/system/css/components/hidden.module.css?tbsiin712 B
www.ens.psl.eu/core/modules/system/css/components/item-list.module.css?tbsiin214 B
www.ens.psl.eu/core/modules/system/css/components/clearfix.module.css?tbsiin279 B
www.ens.psl.eu/core/modules/system/css/components/details.module.css?tbsiin178 B
/core/modules/system/css/components/container-inline.modu...226 B
www.ens.psl.eu/core/modules/system/css/components/fieldgroup.module.css?tbsiin152 B
www.ens.psl.eu/core/modules/system/css/components/align.module.css?tbsiin355 B
/npm/@unicorn-fail/drupal-bootstrap-styles@0.0.2/dist/3.2...3.7 KiB300 ms
/npm/@unicorn-fail/drupal-bootstrap-styles@0.0.2/dist/3.3...3.7 KiB
/npm/@unicorn-fail/drupal-bootstrap-styles@0.0.2/dist/3.2...3.9 KiB300 ms
/npm/@unicorn-fail/drupal-bootstrap-styles@0.0.2/dist/3.1...3.9 KiB300 ms
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/css/all.min.css18.9 KiB1.6 s

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: 823 ms
URLTime Spent
ens.fr/823 ms
www.ens.psl.eu/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
Bienvenue à Normale Sup ! Le mois Femmes et Filles de sciences de l'ENS De févr… body.path-frontpage > div.dialog-off-canvas-main-canvas > div.layout-container > main.main-content-div
0.185

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

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: 160 ms 6.5 KiB
URLTransfer SizeEst Savings
cdn.jsdelivr.net/npm/entreprise7pro-bootstrap@3.4.8/dist/css/bootstrap.css22.0 KiB3.6 KiB
www.ens.psl.eu/themes/ens/css/style.css?tbsiin18.2 KiB2.8 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 160 ms 15.5 KiB
URLTransfer SizeEst Savings
www.ens.psl.eu/themes/ens/js/jquery-ui.js?v=1.x20.4 KiB7.8 KiB
www.ens.psl.eu/core/misc/drupal.js?v=10.6.56.1 KiB4.8 KiB
www.ens.psl.eu/themes/bootstrap/js/drupal.bootstrap.js?tbsiin4.9 KiB2.9 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: 330 ms 52.7 KiB
URLTransfer SizeEst Savings
cdn.jsdelivr.net/npm/entreprise7pro-bootstrap@3.4.8/dist/css/bootstrap.css21.6 KiB20.6 KiB
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/css/all.min.css18.3 KiB18.1 KiB
www.ens.psl.eu/themes/ens/css/style.css?tbsiin18.2 KiB14.0 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.11.3 s813 ms13 ms
platform.twitter.com/widgets.js1.1 s130 ms17 ms
Unattributable1.1 s36 ms0.0 ms
www.ens.psl.eu/509 ms17 ms4.1 ms
www.ens.psl.eu/core/misc/drupal.init.js?v=10.6.5256 ms97 ms0.4 ms
stats-web.ens.psl.eu/matomo.js116 ms74 ms33 ms
platform.twitter.com/js/timeline.e108540dddc96e4b707f5cf259a582d7.js70 ms65 ms1.6 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Other1.5 s
Style & Layout1.4 s
Script Evaluation1.3 s
Parse HTML & CSS217 ms
Script Parsing & Compilation141 ms
Rendering97 ms

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
www.ens.psl.eu/themes/ens/video/ENS_slider_fr.mp41.9 MiB
/sites/default/files/styles/actu_list/public/2026-03/sr.p...332.9 KiB
/sites/default/files/styles/home_header/public/2021-09/co...185.4 KiB
/sites/default/files/styles/portrait/public/actu_vincent_...156.8 KiB
/sites/default/files/styles/portrait/public/actu_wendelin...138.1 KiB
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-brands-400.woff2116.0 KiB
/widgets/widget_iframe.2f70fb173b9000da126c79afe2098f02.h...103.4 KiB
/sites/default/files/styles/portrait/public/actu_fanny_ka...101.9 KiB
/sites/default/files/styles/portrait/public/actu_alice_gu...101.4 KiB
www.ens.psl.eu/themes/ens/images/ENS-bandeau-violet.jpg100.9 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
Bienvenue à Normale Sup div.bl_video > div.item > a.show_video > img
/sites/default/files/styles/home_header/public/2021-09/co...
Femmes et Filles de sciences de l'ENS div.bl_video > div.item > a > img
/sites/default/files/styles/home_header/public/2026-02/ho...
Petites exploratrices, petits explorateurs de la connaissance div.bl_video > div.item > a > img
/sites/default/files/styles/home_header/public/2026-01/ho...
div.header_block > a.more_info > div.event_image > img div.header_block > a.more_info > div.event_image > img
/sites/default/files/styles/image_evenement/public/2021-0...
Historien div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2024-04/gille...
Astrophysicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2024-07/franc...
Mathématicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/Nali_Ananthar...
Prix Nobel de Physique div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/Bill_MG_5252 ...
Mathématicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_alice_gu...
Philosophe et Historien des Sciences div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2020-06/miche...
Philosophe div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/souleymane_ba...
Mathématicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_sylvia_s...
Ecrivain div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/debray_old.jp...
Écrivaine div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/marie-darieus...
Physicien div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2021-06/jean_...
Physicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/suzor-weiner_...
Prix Nobel de Physique div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/inline-images...
Mathématicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2016-12/actu_...
Neuroscientifique div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/Stanislas_Deh...
Ecrivain div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/aime-cesaire-...
Mathématicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_fanny_ka...
Physicien div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/lyderic_0.jpg...
Prix Nobel d'économie div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2020-09/esthe...
Mathématicien div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2019-01/norma...
Ecrivaine div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2023-03/assia...
Écrivain div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/Tristan_Garci...
Historienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_claire_z...
Anthropologue div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_frederic...
Philosophe div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/simone-weil-2...
Mathématicien div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_wendelin...
Écrivaine div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2024-01/const...
Photographe div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/actu_vincent_...
Savant div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/portrait-Past...
Compositeur div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/Amelie Tchern...
Economiste div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2020-09/emman...
Historien div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2024-04/gille...
Astrophysicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/2024-07/franc...
Mathématicienne div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/Nali_Ananthar...
Prix Nobel de Physique div.portrait > a > div.visuel > img
/sites/default/files/styles/portrait/public/Bill_MG_5252 ...
Stratégie des ressources humaines pour les personnels de la recherche div.field > p > a > img

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

●Optimize DOM size
●Modern HTTP
●Optimize viewport for mobile
●Reduce unused JavaScript
●Avoid long main-thread tasks 13 long tasks found
●Avoid non-composited animations 33 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 20 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 50 ms
○INP breakdown
○User Timing marks and measures
79

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
NOUS SOUTENIR div.region > div.noussoutenir > div.noussoutenir_block > a.noussoutenir_lien
FRIENDS OF ENS div.region > div.noussoutenir > div.noussoutenir_block > a.noussoutenir_lien
S’inscrire à la newsletter div.field > p > a.bouton > span

These are opportunities to improve the legibility of your content.

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
Trajectoires div.region > div.home_page > div.hidden_block > h4
Vie des campus ENS div.region > div.home_page > div.hidden_block > h5

These are opportunities to improve keyboard navigation in your application.

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.header_block > a.more_info > div.event_image > img div.header_block > a.more_info > div.event_image > img

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Accéder à la fiche du département Centre interdisciplinaire sur les enjeux stra… div.views-element-container > div.js-view-dom-id-f6e0ac072fffab4b4e67b39d0c5795b35f21634d25d9fc5811c6f08aff0c54a9 > div.select > select#departements
Accéder à la fiche du laboratoire Archéologie et Philologie d'Orient et d'Occid… div.views-element-container > div.js-view-dom-id-072a09af1c4d140730268372948988588f50457afe56e90329d9e326b3f2dd45 > div.select > select#laboratoires
Accéder à la bibliothèque La bibliothèque de Mathématiques et Informatique La b… div.views-element-container > div.js-view-dom-id-f198e958921aa74f1c4154736aa19034e87b0230a0cbd5a2b7d1ac7f2c6d2b08 > div.select > select#bibliothèques

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.dialog-off-canvas-main-canvas > div.layout-container > div.left_sidebar > a.twitter-timeline div.dialog-off-canvas-main-canvas > div.layout-container > div.left_sidebar > a.twitter-timeline
div.home_page > div.header_block > div.slider_video > a div.home_page > div.header_block > div.slider_video > a
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--facebook section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--facebook
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--twitter section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--twitter
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--youtube section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--youtube
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--instagram section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--instagram
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--linkedin section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--linkedin
div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-next div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-next
div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-prev div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-prev
div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-next div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-next
div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-prev div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-prev
div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-next div.bx-wrapper > div.bx-controls > div.bx-controls-direction > a.bx-next
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--facebook section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--facebook
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--twitter section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--twitter
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--youtube section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--youtube
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--instagram section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--instagram
section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--linkedin section#block-socialmedialinks > ul.social-media-links--platforms > li > a.social-media-link-icon--linkedin

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
Mentions légales nav#block-pieddepage > ul > li.menu-level--0 > a
Lettre d’information nav#block-pieddepage > ul > li.menu-level--0 > a

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
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●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
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●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
●Document has a main landmark.
●Deprecated ARIA roles were not used
●ARIA IDs are unique
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
●All heading elements contain content.
○`[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
○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
○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>`.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○Elements with visible text labels have matching accessible names.
○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.
100

Best Practices

●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 browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

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.header_block > a.more_info > div.event_image > img div.header_block > a.more_info > div.event_image > 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
●robots.txt is valid
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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