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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.

54

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/medias/cnaf/Actualités/2026/guide d...3600.0 s230.9 KiB
/sites/default/files/css/css_tMKvmH419Kr2SxoT5KVCM6_CE8g3...3600.0 s225.8 KiB
www.caf.fr/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js3600.0 s164.6 KiB
/sites/default/files/js/js_Nj8LjfMBzzVMczRmqLebZ_KcfWjLlr...3600.0 s85.1 KiB
www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.js3600.0 s79.3 KiB
/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2Eou...3600.0 s58.9 KiB
/sites/default/files/js/js_hXm9K29ULpBHOsC2hvvvqSx4ZlH_gJ...3600.0 s48.4 KiB
www.caf.fr/sites/default/files/smarttag/smarttag-caffr.js3600.0 s32.0 KiB
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/ViePerso%401x.png3600.0 s20.5 KiB
/sites/default/files/styles/image_400x226/public/medias/c...3600.0 s19.8 KiB
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/Handicap%401x.png3600.0 s19.6 KiB
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-italic.woff23600.0 s17.6 KiB
/sites/default/files/styles/image_400x226/public/medias/c...3600.0 s16.5 KiB
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/ViePro%401x.png3600.0 s16.2 KiB
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-500.woff23600.0 s16.2 KiB
/sites/default/files/styles/image_400x226/public/medias/c...3600.0 s16.2 KiB
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-700.woff23600.0 s16.2 KiB
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-300.woff23600.0 s16.1 KiB
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-regular.woff23600.0 s16.1 KiB
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-900.woff23600.0 s16.1 KiB
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/AccidentVie%401x.png3600.0 s15.4 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/logo_vdf.svg3600.0 s15.4 KiB
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/Logement%401x.png3600.0 s13.9 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/logo_cnaf.svg3600.0 s10.9 KiB
/sites/default/files/css/css_eRgj4XR1uTqfR1a-UKnh9Nio2gXm...3600.0 s9.3 KiB
/sites/default/files/css/css_1dT9cbRTbefRu_I_7jpqpX83Ht3M...3600.0 s5.0 KiB
/sites/default/files/css/css_QyxbKQw7o_ot_17ThB4kXNEtqdtU...3600.0 s4.7 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/logo_caf_fr.svg3600.0 s3.6 KiB
/sites/default/files/css/css_MutkL_vAZP6iaS4WakeFi3_gi0M7...3600.0 s3.3 KiB
/modules/contrib/ckeditor_accordion/js/accordion.frontend...3600.0 s2.3 KiB
/sites/default/files/medias/refnat/Pictos/Reseaux-sociaux...3600.0 s2.2 KiB
www.caf.fr/sites/default/files/medias/refnat/Pictos/Big/DemandePresta%401x.svg3600.0 s2.1 KiB
/sites/default/files/js/js_o6G8qF50-szA3UP9Qpy_0v5Tcqedxz...3600.0 s2.0 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-geoloc-gris.png3600.0 s2.0 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/eye.svg3600.0 s1.9 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/pin.svg3600.0 s1.8 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/pic-notification.png3600.0 s1.8 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-arrow-down-white.png3600.0 s1.8 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/france-blue.svg3600.0 s1.8 KiB
www.caf.fr/sites/default/files/medias/refnat/Pictos/Big/Simulation%401x.svg3600.0 s1.7 KiB
www.caf.fr/sites/default/files/medias/refnat/Pictos/Big/Modifier%401x.svg3600.0 s1.6 KiB
www.caf.fr/sites/default/files/medias/refnat/Pictos/Small/SituationVie%401x.svg3600.0 s1.6 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/article.svg3600.0 s1.5 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/user.svg3600.0 s1.5 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-connexion.svg3600.0 s1.4 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/cross.svg3600.0 s1.4 KiB
www.caf.fr/modules/custom/caf_menu/icons/close.svg3600.0 s1.4 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/Cross_blue@1x.svg3600.0 s1.4 KiB
www.caf.fr/sites/default/files/medias/refnat/Pictos/Big/home.svg3600.0 s1.3 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/play.svg3600.0 s1.3 KiB
/sites/default/files/medias/refnat/Pictos/Reseaux-sociaux...3600.0 s1.3 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-burger.svg3600.0 s1.2 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/search.svg3600.0 s1.2 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/plus.svg3600.0 s1.2 KiB
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/arrow-header@1x.png3600.0 s1016 B

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
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-700.woff295 ms
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-900.woff290 ms
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-500.woff255 ms
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-regular.woff250 ms
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-300.woff250 ms
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-italic.woff250 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:37.132 source:map[column:390 line:159 type:source-location url:https://www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.js urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:16.46 source:map[column:368 line:290 type:source-location url:https://www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.js urlProvider:network]] map[reflowTime:20.672 source:map[column:387 line:279 type:source-location url:https://www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.js urlProvider:network]] map[reflowTime:7.419 source:map[column:49615 line:2 type:source-location url:https://www.caf.fr/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2EouzYQp2g2SPU3us.js?scope=footer&delta=0&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV9 urlProvider:network]] map[reflowTime:0.304 source:map[column:50335 line:2 type:source-location url:https://www.caf.fr/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2EouzYQp2g2SPU3us.js?scope=footer&delta=0&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV9 urlProvider:network]] map[reflowTime:0.2 source:map[column:50393 line:2 type:source-location url:https://www.caf.fr/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2EouzYQp2g2SPU3us.js?scope=footer&delta=0&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV9 urlProvider:network]] map[reflowTime:0.198 source:map[column:50457 line:2 type:source-location url:https://www.caf.fr/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2EouzYQp2g2SPU3us.js?scope=footer&delta=0&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV9 urlProvider:network]] map[reflowTime:0.431 source:map[column:49637 line:2 type:source-location url:https://www.caf.fr/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2EouzYQp2g2SPU3us.js?scope=footer&delta=0&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV9 urlProvider:network]] map[reflowTime:0.356 source:map[column:51395 line:2 type:source-location url:https://www.caf.fr/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2EouzYQp2g2SPU3us.js?scope=footer&delta=0&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV9 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.actualite-accueil > div.actualite-accueil-promue > div.actualite-accueil-promue-image > img div.actualite-accueil > div.actualite-accueil-promue > div.actualite-accueil-promue-image > img
/sites/default/files/medias/cnaf/Actualités/2026/guide d...230.3 KiB220.8 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: div.actualite-accueil > div.actualite-accueil-promue > div.actualite-accueil-promue-image > img
path: 1,HTML,1,BODY,2,DIV,0,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,IMG
selector: div.actualite-accueil > div.actualite-accueil-promue > div.actualite-accueil-promue-image > img
snippet: <img src="/sites/default/files/medias/cnaf/Actualit%C3%A9s/2026/guide%20des%20presta…" alt="">

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
www.caf.fr/http/1.1
www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.jshttp/1.1
www.caf.fr/sites/default/files/smarttag/smarttag-caffr.jshttp/1.1
/sites/default/files/css/css_1dT9cbRTbefRu_I_7jpqpX83Ht3M...http/1.1
/sites/default/files/css/css_QyxbKQw7o_ot_17ThB4kXNEtqdtU...http/1.1
/sites/default/files/css/css_eRgj4XR1uTqfR1a-UKnh9Nio2gXm...http/1.1
/sites/default/files/css/css_MutkL_vAZP6iaS4WakeFi3_gi0M7...http/1.1
/sites/default/files/css/css_tMKvmH419Kr2SxoT5KVCM6_CE8g3...http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/logo_cnaf.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/logo_caf_fr.svghttp/1.1
www.caf.fr/sites/default/files/medias/refnat/Pictos/Big/home.svghttp/1.1
/sites/default/files/medias/cnaf/Actualités/2026/guide d...http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-geoloc-gris.pnghttp/1.1
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/ViePerso%401x.pnghttp/1.1
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/ViePro%401x.pnghttp/1.1
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/Logement%401x.pnghttp/1.1
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/Handicap%401x.pnghttp/1.1
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/AccidentVie%401x.pnghttp/1.1
/sites/default/files/styles/image_400x226/public/medias/c...http/1.1
/sites/default/files/styles/image_400x226/public/medias/c...http/1.1
/sites/default/files/styles/image_400x226/public/medias/c...http/1.1
/sites/default/files/medias/refnat/Pictos/Reseaux-sociaux...http/1.1
/sites/default/files/medias/refnat/Pictos/Reseaux-sociaux...http/1.1
/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2Eou...http/1.1
/sites/default/files/js/js_Nj8LjfMBzzVMczRmqLebZ_KcfWjLlr...http/1.1
/sites/default/files/js/js_o6G8qF50-szA3UP9Qpy_0v5Tcqedxz...http/1.1
/modules/contrib/ckeditor_accordion/js/accordion.frontend...http/1.1
/sites/default/files/js/js_hXm9K29ULpBHOsC2hvvvqSx4ZlH_gJ...http/1.1
www.caf.fr/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.jshttp/1.1
www.caf.fr/redirect/redirect.php?url_moncompte=jsonhttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-burger.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/eye.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/search.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/plus.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/pin.svghttp/1.1
www.caf.fr/sites/default/files/medias/refnat/Pictos/Big/Simulation%401x.svghttp/1.1
www.caf.fr/sites/default/files/medias/refnat/Pictos/Big/DemandePresta%401x.svghttp/1.1
www.caf.fr/sites/default/files/medias/refnat/Pictos/Big/Modifier%401x.svghttp/1.1
www.caf.fr/sites/default/files/medias/refnat/Pictos/Small/SituationVie%401x.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/logo_vdf.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/article.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/play.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-arrow-down-white.pnghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-500.woff2http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-regular.woff2http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-900.woff2http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-300.woff2http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-700.woff2http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-italic.woff2http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/pic-notification.pnghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-connexion.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/france-blue.svghttp/1.1
www.caf.fr/modules/custom/caf_menu/icons/close.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/arrow-header@1x.pnghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/Cross_blue@1x.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/user.svghttp/1.1
www.caf.fr/c99a4269-161c-4242-a3f0-28d44fa6ce24?http/1.1
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/cross.svghttp/1.1
www.caf.fr/themes/custom/caf_bootstrap5/favicon.icohttp/1.1
/rb_bf53223bka?type=js3&sn=v_4_srv_-2D30479_sn_3P19V9UBH1...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.

URLTransfer SizeDuration
/sites/default/files/css/css_tMKvmH419Kr2SxoT5KVCM6_CE8g3...225.8 KiB2.9 s
www.caf.fr/sites/default/files/smarttag/smarttag-caffr.js32.0 KiB933 ms
/sites/default/files/css/css_eRgj4XR1uTqfR1a-UKnh9Nio2gXm...9.3 KiB483 ms
/sites/default/files/css/css_MutkL_vAZP6iaS4WakeFi3_gi0M7...3.3 KiB483 ms
/sites/default/files/css/css_1dT9cbRTbefRu_I_7jpqpX83Ht3M...5.0 KiB333 ms
www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.js79.3 KiB2.0 s
/sites/default/files/css/css_QyxbKQw7o_ot_17ThB4kXNEtqdtU...4.7 KiB633 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.

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: 760 ms 211.6 KiB
URLTransfer SizeEst Savings
/sites/default/files/css/css_tMKvmH419Kr2SxoT5KVCM6_CE8g3...225.1 KiB211.6 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: 970 ms 169.3 KiB
URLTransfer SizeEst Savings
/sites/default/files/js/js_Nj8LjfMBzzVMczRmqLebZ_KcfWjLlr...84.4 KiB58.2 KiB
www.caf.fr/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js164.2 KiB39.6 KiB
/sites/default/files/js/js_hXm9K29ULpBHOsC2hvvvqSx4ZlH_gJ...47.7 KiB38.4 KiB
www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.js78.7 KiB33.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation1.1 s
Other561 ms
Style & Layout318 ms
Script Parsing & Compilation110 ms
Parse HTML & CSS91 ms
Rendering35 ms
Garbage Collection6.8 ms

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.actualite-accueil > div.actualite-accueil-promue > div.actualite-accueil-promue-image > img div.actualite-accueil > div.actualite-accueil-promue > div.actualite-accueil-promue-image > img
/sites/default/files/medias/cnaf/Actualités/2026/guide d...
div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/ViePerso%401x.png
div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/ViePro%401x.png
div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/Logement%401x.png
div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/Handicap%401x.png
div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button div.menu-thematique__mobile-content > div.thematique-mbutton > div.image-tdiv > img.thematique-image-button
www.caf.fr/sites/default/files/medias/cnaf/Thematiques/AccidentVie%401x.png
Allocation familiale - Retour à l'accueil div#region-header > div#container_caffr > a.region-header__link--mobile > img.nav-link
www.caf.fr/themes/custom/caf_bootstrap5/images/icons/logo_caf_fr.svg
Suivez-nous sur Facebook div.d-flex > p > a > img
/sites/default/files/medias/refnat/Pictos/Reseaux-sociaux...
div.actualite-accueil-promue-description > div.item-description-info > div.item-description-info-categorie > img div.actualite-accueil-promue-description > div.item-description-info > div.item-description-info-categorie > img
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-geoloc-gris.png

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

●Layout shift culprits
●Document request latency
●Optimize DOM size
●LCP breakdown
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Avoids enormous network payloads Total size was 1,304 KiB
●JavaScript execution time 1.2 s
●Avoid long main-thread tasks 9 long tasks found
●Avoid non-composited animations 2 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 20 ms
●Server Backend Latencies 30 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 190 ms
○INP breakdown
○User Timing marks and measures
○Avoid large layout shifts
88

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

ARIA roles must have valid values in order to perform their intended accessibility functions. Learn more about valid ARIA roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
A la une en ce moment Actualité nationale 31.03.2026 Le guide des prestation… body.is-mobile > div.dialog-off-canvas-main-canvas > div#wrapper-page > main#main-content

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
Choisir ma Caf Afin de mieux vous accompagner dans vos besoins et de personnal… div.dialog-off-canvas-main-canvas > div#wrapper-page > header#theme-header > div#popup_geoloc

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.

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
VIE PROFESSIONNELLE div.fil-actualite-accueil > div.fil-actualite-accueil-item > div.etiquette-thematique > 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
Menu Principal - Espaces header#theme-header > div#region-header > nav#block-caf-bootstrap5-menuprincipal > h5#block-caf-bootstrap5-menuprincipal-menu
Pied de page Allocataires section#region-footer > div#footer > nav#block-pieddepageallocataires > h5#block-pieddepageallocataires-menu

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Input buttons have discernible text.
●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
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
●Definition list items are wrapped in `<dl>` elements
●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
●Touch targets have sufficient size and spacing.
●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
○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
○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 type="image">` elements have `[alt]` text
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○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 display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
div.paragraph > div.vdf-content__card-item > div.vdf-content__card-item--header > img.vdf-content__card-item--header-image div.paragraph > div.vdf-content__card-item > div.vdf-content__card-item--header > img.vdf-content__card-item--header-image
/sites/default/files/styles/image_400x226/public/medias/c...372 x 213 (1.75)400 x 226 (1.77)

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.actualite-accueil-promue-description > div.item-description-info > div.item-description-info-categorie > img div.actualite-accueil-promue-description > div.item-description-info > div.item-description-info-categorie > img
www.caf.fr/themes/custom/caf_bootstrap5/images/icones/pic-geoloc-gris.png16 x 2016 x 2024 x 30
●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
●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
100

SEO

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

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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