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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.

59

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
/sites/default/files/styles/accueil_carousel_block_droite...7200.0 s846.2 KiB
/sites/default/files/styles/accueil_carousel_block_droite...7200.0 s525.1 KiB
/sites/default/files/styles/accueil_carousel_block_droite...7200.0 s382.2 KiB
/sites/default/files/styles/accueil_actualite/public/2026...7200.0 s215.0 KiB
/sites/default/files/styles/focus_main/public/2025-12/fan...7200.0 s148.6 KiB
/sites/default/files/styles/accueil_actualite/public/2026...7200.0 s121.9 KiB
/sites/default/files/styles/focus_secondary/public/2025-1...7200.0 s120.6 KiB
/sites/default/files/styles/focus_secondary/public/2025-0...7200.0 s75.7 KiB
cnil.fr/themes/custom/bootstrap_cnil/css/style.css?tboeb77200.0 s70.3 KiB
/themes/custom/bootstrap_cnil/font/OpenSansCondensed/Open...7200.0 s55.2 KiB
/themes/custom/bootstrap_cnil/font/OpenSansCondensed/Open...7200.0 s44.0 KiB
/modules/contrib/tacjs/assets/vendor/tarteaucitron.js/tar...7200.0 s40.1 KiB
/sites/default/files/styles/accueil_actualite/public/2026...7200.0 s37.8 KiB
/sites/default/files/styles/accueil_actualite/public/2026...7200.0 s36.7 KiB
cnil.fr/core/assets/vendor/jquery/jquery.min.js?v=3.7.17200.0 s30.6 KiB
piwik.cnil.fr/matomo.js0.0 ms19.7 KiB
/modules/contrib/tacjs/assets/vendor/tarteaucitron.js/tar...7200.0 s23.0 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/jquery.mCustomScrollbar.js?tboeb77200.0 s22.0 KiB
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-condbold-webfont.woff27200.0 s20.0 KiB
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-extrabold-webfont.woff27200.0 s19.3 KiB
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-bold-webfont.woff27200.0 s19.2 KiB
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-regular-webfont.woff27200.0 s18.4 KiB
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-light-webfont.woff27200.0 s18.0 KiB
/sites/default/files/styles/accueil_actualite/public/2026...7200.0 s16.5 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/slick.min.js?tboeb77200.0 s10.3 KiB
/sites/default/files/styles/accueil_actualite/public/2026...7200.0 s9.9 KiB
cnil.fr/core/assets/vendor/underscore/underscore-min.js?v=1.13.77200.0 s8.3 KiB
/sites/default/files/styles/accueil_demarches/public/2023...7200.0 s6.9 KiB
/sites/default/files/languages/fr_Ol6GqvZbhE2emJ9M9avhr_o...7200.0 s6.8 KiB
cnil.fr/core/misc/states.js?v=10.5.67200.0 s6.4 KiB
cnil.fr/core/misc/drupal.js?v=10.5.67200.0 s6.3 KiB
/modules/contrib/tacjs/assets/vendor/tarteaucitron.js/css...7200.0 s6.2 KiB
/sites/default/files/styles/accueil_demarches/public/2023...7200.0 s6.0 KiB
/sites/default/files/styles/accueil_demarches/public/2023...7200.0 s6.0 KiB
cnil.fr/themes/custom/bootstrap_cnil/logo.png7200.0 s5.5 KiB
cnil.fr/modules/contrib/webform/js/webform.states.js?v=10.5.67200.0 s5.2 KiB
cnil.fr/themes/contrib/bootstrap/js/drupal.bootstrap.js?tboeb77200.0 s5.0 KiB
cnil.fr/themes/custom/bootstrap_cnil/css/jquery.mCustomScrollbar.min.css?tboeb77200.0 s5.0 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/page.js?tboeb77200.0 s4.7 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/tooltip.js?tboeb77200.0 s4.3 KiB
cnil.fr/themes/custom/bootstrap_cnil/img/hr.png7200.0 s3.8 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/accessibility.js?tboeb77200.0 s3.5 KiB
cnil.fr/themes/custom/bootstrap_cnil/bootstrap/js/tooltip.js?tboeb77200.0 s3.4 KiB
cnil.fr/themes/custom/bootstrap_base/css/overrides.css?tboeb77200.0 s3.1 KiB
cnil.fr/themes/custom/bootstrap_base/css/webform.css?tboeb77200.0 s3.1 KiB
cnil.fr/themes/custom/bootstrap_cnil/logo-cnil-mini.png7200.0 s3.0 KiB
cnil.fr/themes/contrib/bootstrap/js/attributes.js?tboeb77200.0 s2.8 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/main.js?tboeb77200.0 s2.7 KiB
cnil.fr/themes/custom/bootstrap_cnil/bootstrap/js/collapse.js?tboeb77200.0 s2.6 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/dropdown.js?tboeb77200.0 s2.6 KiB
cnil.fr/themes/custom/bootstrap_cnil/font/cnil.ttf?7yre0p7200.0 s2.6 KiB
cnil.fr/themes/custom/bootstrap_base/css/timeline.css?tboeb77200.0 s2.5 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/header.js?tboeb77200.0 s2.4 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/modal.js?tboeb77200.0 s2.3 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/respond.min.js?tboeb77200.0 s2.3 KiB
cnil.fr/themes/custom/bootstrap_base/js/respond.min.js?tboeb77200.0 s2.3 KiB
cnil.fr/themes/custom/bootstrap_cnil/bootstrap/js/carousel.js?tboeb77200.0 s2.3 KiB
cnil.fr/themes/contrib/bootstrap/js/theme.js?tboeb77200.0 s2.2 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/jquery.mousewheel.min.js?tboeb77200.0 s2.2 KiB
cnil.fr/themes/custom/bootstrap_cnil/bootstrap/js/modal.js?tboeb77200.0 s2.2 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/carousel.js?tboeb77200.0 s2.1 KiB
cnil.fr/themes/custom/bootstrap_cnil/logo-footer.png7200.0 s1.9 KiB
cnil.fr/themes/contrib/bootstrap/js/popover.js?tboeb77200.0 s1.9 KiB
cnil.fr/core/assets/vendor/once/once.min.js?v=1.0.17200.0 s1.7 KiB
cnil.fr/modules/commons/cnil_tacjs_page/js/lang/tarteaucitron.fr.js?tboeb77200.0 s1.7 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/collapse.js?tboeb77200.0 s1.7 KiB
cnil.fr/themes/custom/bootstrap_cnil/bootstrap/js/dropdown.js?tboeb77200.0 s1.7 KiB
cnil.fr/modules/custom/cnil_global/js/user-space-switcher.js?v=10.5.67200.0 s1.7 KiB
cnil.fr/themes/contrib/bootstrap/js/misc/states.js?tboeb77200.0 s1.7 KiB
cnil.fr/themes/custom/bootstrap_base/css/page_liste.css?tboeb77200.0 s1.6 KiB
cnil.fr/modules/contrib/webform/js/webform.behaviors.js?v=10.5.67200.0 s1.6 KiB
cnil.fr/themes/custom/bootstrap_cnil/bootstrap/js/tab.js?tboeb77200.0 s1.6 KiB
cnil.fr/themes/custom/bootstrap_base/css/views.css?tboeb77200.0 s1.5 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/tab.js?tboeb77200.0 s1.5 KiB
cnil.fr/themes/custom/bootstrap_base/js/html5shiv.min.js?tboeb77200.0 s1.4 KiB
/modules/contrib/webform/modules/webform_bootstrap/js/web...7200.0 s1.4 KiB
cnil.fr/themes/custom/bootstrap_base/js/page.js?tboeb77200.0 s1.4 KiB
cnil.fr/themes/custom/bootstrap_cnil/bootstrap/js/popover.js?tboeb77200.0 s1.4 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/popover.js?tboeb77200.0 s1.4 KiB
cnil.fr/modules/contrib/datalayer/js/datalayer.js?v=1.x7200.0 s1.3 KiB
cnil.fr/core/modules/system/css/components/item-list.module.css?tboeb77200.0 s1.3 KiB
cnil.fr/modules/commons/cnil_site/assets/js/video.js?v=10.5.67200.0 s1.2 KiB
cnil.fr/core/modules/system/css/components/details.module.css?tboeb77200.0 s1.2 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/alert.js?tboeb77200.0 s1.2 KiB
cnil.fr/themes/custom/bootstrap_cnil/bootstrap/js/alert.js?tboeb77200.0 s1.2 KiB
cnil.fr/modules/contrib/tacjs/js/main.js?tboeb77200.0 s1.1 KiB
cnil.fr/themes/custom/bootstrap_base/css/navigation.css?tboeb77200.0 s1.1 KiB
cnil.fr/themes/custom/bootstrap_base/bootstrap/js/onglets.js?tboeb77200.0 s1.1 KiB
cnil.fr/modules/commons/cnil_tacjs_page/js/main.js?tboeb77200.0 s1.1 KiB
cnil.fr/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tboeb77200.0 s977 B
cnil.fr/modules/commons/cnil_tacjs_page/js/tarteaucitron.services.js?tboeb77200.0 s940 B
cnil.fr/themes/custom/bootstrap_base/css/print.css?tboeb77200.0 s799 B
cnil.fr/modules/contrib/matomo/js/matomo.js?v=10.5.67200.0 s787 B
cnil.fr/core/modules/system/css/components/hidden.module.css?tboeb77200.0 s763 B
/modules/contrib/webform/modules/webform_bootstrap/css/we...7200.0 s756 B
cnil.fr/themes/custom/bootstrap_base/css/node_only_body.css?tboeb77200.0 s755 B
cnil.fr/themes/contrib/bootstrap/js/tooltip.js?tboeb77200.0 s748 B
cnil.fr/themes/custom/bootstrap_base/css/search.css?tboeb77200.0 s743 B
cnil.fr/themes/custom/bootstrap_cnil/css/print.css?tboeb77200.0 s600 B
cnil.fr/core/misc/drupal.init.js?v=10.5.67200.0 s596 B
cnil.fr/core/modules/system/css/components/js.module.css?tboeb77200.0 s553 B
cnil.fr/themes/custom/bootstrap_cnil/js/matomo.js?tboeb77200.0 s519 B
cnil.fr/core/misc/drupalSettingsLoader.js?v=10.5.67200.0 s492 B
cnil.fr/modules/commons/cnil_libraries/css/typography.css?tboeb77200.0 s466 B
cnil.fr/core/modules/system/css/components/tablesort.module.css?tboeb77200.0 s447 B
cnil.fr/core/modules/system/css/components/system-status-counter.css?tboeb77200.0 s421 B
/core/modules/system/css/components/system-status-report-...7200.0 s411 B
cnil.fr/themes/custom/bootstrap_base/css/auteur.css?tboeb77200.0 s411 B
cnil.fr/themes/custom/bootstrap_cnil/css/mode-view-grid.css?tboeb77200.0 s362 B
cnil.fr/core/modules/system/css/components/position-container.module.css?tboeb77200.0 s332 B
cnil.fr/core/modules/system/css/components/clearfix.module.css?tboeb77200.0 s327 B
cnil.fr/core/modules/system/css/components/align.module.css?tboeb77200.0 s321 B
cnil.fr/themes/contrib/bootstrap/js/bootstrap-pre-init.js?tboeb77200.0 s312 B
cnil.fr/core/modules/system/css/components/reset-appearance.module.css?tboeb77200.0 s293 B
/core/modules/system/css/components/system-status-report-...7200.0 s278 B
cnil.fr/core/modules/system/css/components/container-inline.module.css?tboeb77200.0 s274 B
cnil.fr/core/modules/system/css/components/resize.module.css?tboeb77200.0 s260 B
cnil.fr/themes/custom/bootstrap_cnil/js/display_cookies.js?tboeb77200.0 s258 B
cnil.fr/core/modules/system/css/components/nowrap.module.css?tboeb77200.0 s212 B
cnil.fr/core/modules/system/css/components/fieldgroup.module.css?tboeb77200.0 s199 B
/matomo.php?action_name=Particulier%20%7C%20CNIL&idsite=1...0.0 ms146 B
cnil.fr/themes/custom/bootstrap_cnil/css/base/content.css?tboeb77200.0 s83 B

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-regular-webfont.woff230 ms
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-condbold-webfont.woff225 ms
/themes/custom/bootstrap_cnil/font/OpenSansCondensed/Open...25 ms
cnil.fr/themes/custom/bootstrap_cnil/font/cnil.ttf?7yre0p20 ms
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-bold-webfont.woff220 ms
/themes/custom/bootstrap_cnil/font/OpenSansCondensed/Open...20 ms
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-light-webfont.woff215 ms
cnil.fr/themes/custom/bootstrap_cnil/font/opensans-extrabold-webfont.woff215 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:74.501 source:map[column:22 line:19 type:source-location url:https://cnil.fr/core/misc/drupal.init.js?v=10.5.6 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:34.931 source:map[column:49615 line:1 type:source-location url:https://cnil.fr/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:33.181 source:map[column:50335 line:1 type:source-location url:https://cnil.fr/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.368 source:map[column:50393 line:1 type:source-location url:https://cnil.fr/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.292 source:map[column:50457 line:1 type:source-location url:https://cnil.fr/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:5.245 source:map[column:49637 line:1 type:source-location url:https://cnil.fr/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 urlProvider:network]] map[reflowTime:0.484 source:map[column:51395 line:1 type:source-location url:https://cnil.fr/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 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
div.slick-track > div#slick-slide00 > div.accueil_carrousel_block_droite_image > img.img-responsive div.slick-track > div#slick-slide00 > div.accueil_carrousel_block_droite_image > img.img-responsive
/sites/default/files/styles/accueil_carousel_block_droite...845.1 KiB817.1 KiB
div.slick-track > div#slick-slide01 > div.accueil_carrousel_block_droite_image > img.img-responsive div.slick-track > div#slick-slide01 > div.accueil_carrousel_block_droite_image > img.img-responsive
/sites/default/files/styles/accueil_carousel_block_droite...524.4 KiB496.3 KiB
div.slick-track > div#slick-slide02 > div.accueil_carrousel_block_droite_image > img.img-responsive div.slick-track > div#slick-slide02 > div.accueil_carrousel_block_droite_image > img.img-responsive
/sites/default/files/styles/accueil_carousel_block_droite...380.8 KiB352.7 KiB
div.row > div.col-xs-12 > div.all-wrapper > img.img-responsive div.row > div.col-xs-12 > div.all-wrapper > img.img-responsive
/sites/default/files/styles/accueil_actualite/public/2026...214.7 KiB197.1 KiB
div.slick-track > div.section--focus-block > div.inner-wrapper > img.img-responsive div.slick-track > div.section--focus-block > div.inner-wrapper > img.img-responsive
/sites/default/files/styles/focus_main/public/2025-12/fan...148.4 KiB128.0 KiB
div.row > div.col-xs-12 > div.all-wrapper > img.img-responsive div.row > div.col-xs-12 > div.all-wrapper > img.img-responsive
/sites/default/files/styles/accueil_actualite/public/2026...121.6 KiB104.0 KiB
div.slick-track > div.section--focus-block > div.inner-wrapper > img.img-responsive div.slick-track > div.section--focus-block > div.inner-wrapper > img.img-responsive
/sites/default/files/styles/focus_secondary/public/2025-1...119.4 KiB102.0 KiB
div.slick-track > div.section--focus-block > div.inner-wrapper > img.img-responsive div.slick-track > div.section--focus-block > div.inner-wrapper > img.img-responsive
/sites/default/files/styles/focus_secondary/public/2025-0...75.5 KiB58.1 KiB
div.row > div.col-xs-12 > div.all-wrapper > img.img-responsive div.row > div.col-xs-12 > div.all-wrapper > img.img-responsive
/sites/default/files/styles/accueil_actualite/public/2026...36.6 KiB19.1 KiB
div.row > div.col-xs-12 > div.all-wrapper > img.img-responsive div.row > div.col-xs-12 > div.all-wrapper > img.img-responsive
/sites/default/files/styles/accueil_actualite/public/2026...36.5 KiB19.0 KiB
div.slick-track > div.paragraph > div.field-image > img.img-responsive div.slick-track > div.paragraph > div.field-image > img.img-responsive
/sites/default/files/styles/accueil_demarches/public/2023...6.8 KiB5.1 KiB
div.slick-track > div.paragraph > div.field-image > img.img-responsive div.slick-track > div.paragraph > div.field-image > img.img-responsive
/sites/default/files/styles/accueil_demarches/public/2023...5.9 KiB4.2 KiB
div.slick-track > div.paragraph > div.field-image > img.img-responsive div.slick-track > div.paragraph > div.field-image > img.img-responsive
/sites/default/files/styles/accueil_demarches/public/2023...5.8 KiB4.1 KiB

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
value: No additional origins are good candidates for preconnecting

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
cnil.fr/themes/custom/bootstrap_cnil/css/style.css?tboeb770.3 KiB450 ms
cnil.fr/themes/custom/bootstrap_base/css/timeline.css?tboeb72.5 KiB150 ms
cnil.fr/themes/custom/bootstrap_cnil/css/mode-view-grid.css?tboeb7362 B
cnil.fr/themes/custom/bootstrap_cnil/css/jquery.mCustomScrollbar.min.css?tboeb75.0 KiB
cnil.fr/themes/custom/bootstrap_base/css/page_liste.css?tboeb71.6 KiB
cnil.fr/themes/custom/bootstrap_base/css/node_only_body.css?tboeb7755 B
cnil.fr/themes/custom/bootstrap_base/css/auteur.css?tboeb7411 B
cnil.fr/themes/custom/bootstrap_base/css/search.css?tboeb7743 B
cnil.fr/themes/custom/bootstrap_cnil/css/base/content.css?tboeb783 B
cnil.fr/core/modules/system/css/components/item-list.module.css?tboeb71.3 KiB
cnil.fr/themes/custom/bootstrap_base/css/views.css?tboeb71.5 KiB
cnil.fr/themes/custom/bootstrap_base/css/webform.css?tboeb73.1 KiB
cnil.fr/themes/custom/bootstrap_base/css/navigation.css?tboeb71.1 KiB
cnil.fr/themes/custom/bootstrap_base/css/overrides.css?tboeb73.1 KiB
/modules/contrib/webform/modules/webform_bootstrap/css/we...756 B
cnil.fr/core/modules/system/css/components/nowrap.module.css?tboeb7212 B
cnil.fr/core/modules/system/css/components/js.module.css?tboeb7553 B
/modules/contrib/tacjs/assets/vendor/tarteaucitron.js/css...6.2 KiB
cnil.fr/core/modules/system/css/components/clearfix.module.css?tboeb7327 B
cnil.fr/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tboeb7977 B
cnil.fr/modules/commons/cnil_libraries/css/typography.css?tboeb7466 B
cnil.fr/core/modules/system/css/components/fieldgroup.module.css?tboeb7199 B
cnil.fr/core/modules/system/css/components/hidden.module.css?tboeb7763 B
cnil.fr/core/modules/system/css/components/container-inline.module.css?tboeb7274 B
/core/modules/system/css/components/system-status-report-...278 B
/core/modules/system/css/components/system-status-report-...411 B
cnil.fr/core/modules/system/css/components/tablesort.module.css?tboeb7447 B
cnil.fr/core/modules/system/css/components/details.module.css?tboeb71.2 KiB
cnil.fr/core/modules/system/css/components/system-status-counter.css?tboeb7421 B
cnil.fr/core/modules/system/css/components/align.module.css?tboeb7321 B
cnil.fr/core/modules/system/css/components/resize.module.css?tboeb7260 B
cnil.fr/core/modules/system/css/components/reset-appearance.module.css?tboeb7293 B
cnil.fr/core/modules/system/css/components/position-container.module.css?tboeb7332 B

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: 812 ms
URLTime Spent
cnil.fr/812 ms
cnil.fr/fr0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

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: 150 ms 11.2 KiB
URLTransfer SizeEst Savings
cnil.fr/themes/custom/bootstrap_cnil/css/style.css?tboeb770.3 KiB11.2 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: 260 ms 44.2 KiB
URLTransfer SizeEst Savings
/modules/contrib/tacjs/assets/vendor/tarteaucitron.js/tar...40.0 KiB10.9 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/jquery.mCustomScrollbar.js?tboeb721.9 KiB8.5 KiB
/modules/contrib/tacjs/assets/vendor/tarteaucitron.js/tar...22.9 KiB8.3 KiB
cnil.fr/core/misc/drupal.js?v=10.5.66.1 KiB4.8 KiB
cnil.fr/core/misc/states.js?v=10.5.66.3 KiB4.3 KiB
cnil.fr/themes/contrib/bootstrap/js/drupal.bootstrap.js?tboeb74.9 KiB2.9 KiB
cnil.fr/modules/contrib/webform/js/webform.states.js?v=10.5.65.1 KiB2.4 KiB
cnil.fr/themes/custom/bootstrap_cnil/js/accessibility.js?tboeb72.5 KiB2.0 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: 450 ms 65.8 KiB
URLTransfer SizeEst Savings
cnil.fr/themes/custom/bootstrap_cnil/css/style.css?tboeb770.2 KiB65.8 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: 150 ms 29.4 KiB
URLTransfer SizeEst Savings
/modules/contrib/tacjs/assets/vendor/tarteaucitron.js/tar...40.0 KiB29.4 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/sites/default/files/styles/accueil_carousel_block_droite...846.2 KiB
/sites/default/files/styles/accueil_carousel_block_droite...525.1 KiB
/sites/default/files/styles/accueil_carousel_block_droite...382.2 KiB
/sites/default/files/styles/accueil_actualite/public/2026...215.0 KiB
/sites/default/files/styles/focus_main/public/2025-12/fan...148.6 KiB
/sites/default/files/styles/accueil_actualite/public/2026...121.9 KiB
/sites/default/files/styles/focus_secondary/public/2025-1...120.6 KiB
/sites/default/files/styles/focus_secondary/public/2025-0...75.7 KiB
cnil.fr/themes/custom/bootstrap_cnil/css/style.css?tboeb770.3 KiB
/themes/custom/bootstrap_cnil/font/OpenSansCondensed/Open...55.2 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
div.mobile-navbar > a > picture > img div.mobile-navbar > a > picture > img
cnil.fr/themes/custom/bootstrap_cnil/logo-cnil-mini.png

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

●Layout shift culprits
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●JavaScript execution time 0.4 s
●Minimizes main-thread work 2.0 s
●Avoid long main-thread tasks 7 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 90 ms
●Server Backend Latencies 130 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 100 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○LCP request discovery
○User Timing marks and measures
○Avoid non-composited animations
76

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.

ARIA

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Hypertrucage (deepfake) : comment se protéger et signaler les contenus illicite… div.row > div.col-xs-12 > div#carousel_accueil > div.carousel-inner

Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
FantomApp : l’application pour aider les 10-15 ans à se protéger sur les réseau… div.focus-block--wrapper > div.slick-list > div.slick-track > div.section--focus-block

When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Hypertrucage (deepfake) : comment se protéger et signaler les contenus illicite… div.row > div.col-xs-12 > div#carousel_accueil > div.carousel-inner

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.dialog-off-canvas-main-canvas > header.page--header > div.mobile-navbar > button.navbar-toggle div.dialog-off-canvas-main-canvas > header.page--header > div.mobile-navbar > button.navbar-toggle
header.page--header > div.mobile-navbar > div.search > button.search-btn header.page--header > div.mobile-navbar > div.search > button.search-btn

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.mobile-navbar > a > picture > img div.mobile-navbar > a > picture > 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
Ma sécurité numérique div.item > ul > li > a
Sites web et réseaux sociaux div.item > ul > li > a
Smartphones et applications div.item > ul > li > a
Objets connectés div.item > ul > li > a
Enfants et ados div.item > ul > li > a
Santé div.item > ul > li > a
Social div.item > ul > li > a
Logement div.item > ul > li > a
Travail div.item > ul > li > a
Intelligence artificielle (IA) div.item > ul > li > a
Achats et publicité div.item > ul > li > a
Banque/Assurance div.item > ul > li > a
Citoyenneté div.item > ul > li > a
Sport div.item > ul > li > a
Transports et mobilité div.item > ul > li > a
Vie associative div.item > ul > li > a
Missions div.item > ul > li > a
Fonctionnement div.item > ul > li > a
En Europe et dans le monde div.item > ul > li > a
L’histoire de la CNIL en vidéo div.item > ul > li > a
Travailler à la CNIL div.item > ul > li > a
Marchés publics div.item > ul > li > a
Consultations publiques div.item > ul > li > a
Saisir la CNIL div.item > ul > li > a
Questions/réponses div.item > ul > li > a
Ressources pédagogiques div.item > ul > li > a
Affiches div.item > ul > li > a
Rapports et chiffres clés div.item > ul > li > a
FR li > ul > li > a.is-active
EN li > ul > li > 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]`s are contained by their required parent element
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●`[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 use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<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
○Form elements have associated labels
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○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.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
92

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLDisplayed sizeActual sizeExpected size
div.slick-track > div.paragraph > div.field-image > img.img-responsive div.slick-track > div.paragraph > div.field-image > img.img-responsive
/sites/default/files/styles/accueil_demarches/public/2023...103 x 103103 x 103155 x 155
div.mobile-navbar > a > picture > img div.mobile-navbar > a > picture > img
cnil.fr/themes/custom/bootstrap_cnil/logo-cnil-mini.png129 x 22129 x 22194 x 33

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
cnil.fr/fr
The value for the Content-Security-Policy directive 'base-uri' contains one or more invalid characters. In a source expression, non-whitespace characters outside ASCII 0x21-0x7E must be Punycode-encoded, as described in RFC 3492 (https://tools.ietf.org/html/rfc3492), if part of the hostname and percent-encoded, as described in RFC 3986, section 2.1 (http://tools.ietf.org/html/rfc3986#section-2.1), if part of the path.
cnil.fr/fr
Unrecognized Content-Security-Policy directive 'includeSubdomains'.
cnil.fr/fr
Unrecognized Content-Security-Policy directive 'preload'.
●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
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●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
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
85

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

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.mobile-navbar > a > picture > img div.mobile-navbar > a > picture > 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
●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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