{"id":1804776,"date":"2019-12-19T17:10:00","date_gmt":"2019-12-19T16:10:00","guid":{"rendered":"https:\/\/wp-rocket.me\/?p=1804776"},"modified":"2020-02-26T21:46:02","modified_gmt":"2020-02-26T20:46:02","slug":"le-guide-ultime-de-pagespeed-insights-by-google","status":"publish","type":"post","link":"https:\/\/wp-rocket.me\/fr\/blog\/le-guide-ultime-de-pagespeed-insights-by-google\/","title":{"rendered":"Le guide ultime de PageSpeed Insights by Google"},"content":{"rendered":"\n<p>Lorsqu&rsquo;il est question de mesurer la vitesse de votre site, il existe une multitude d&rsquo;outils de test disponibles. Certains d&rsquo;entre eux sont tr\u00e8s simples, d&rsquo;autres vont plus loin et fournissent de nombreuses indications. <\/p>\n\n\n\n<p>De PageSpeed Insights \u00e0 GTMetrix, Pingdom ou WebPageTest, vous avez l\u2019embarras du choix.<\/p>\n\n\n\n<p>N\u00e9anmoins, on sait que la plupart des personnes qui s\u2019attaquent \u00e0 la mesure de vitesse d\u2019une page pour la premi\u00e8re fois se tourneront tr\u00e8s probablement vers PageSpeed Insights by Google. <\/p>\n\n\n\n<p>Dans ce guide d\u00e9taill\u00e9, nous allons nous concentrer sur cet outil tr\u00e8s populaire. Nous vous montrerons comment comprendre et utiliser ses r\u00e9sultats et comment r\u00e9gler ses recommandations les plus courantes. Nous vous ferons aussi quelques suggestions d\u2019autres outils de test.<\/p>\n\n\n\n<p>Chez WP Rocket, nous sommes convaincus qu\u2019optimiser les performances web de votre site ne devrait pas tenir \u00e0 un seul outil. Il existe de nombreux outils de test de performance gratuits et d\u2019excellente qualit\u00e9, alors profitez-en.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">PageSpeed Insights : vue d\u2019ensemble<\/h2>\n\n\n\n<p>Google a lanc\u00e9 la premi\u00e8re version de PageSpeed Insights vers 2013. Ils voulaient fournir un outil d\u2019analyse de performance et le rendre accessible \u00e0 un large public.\u00a0<\/p>\n\n\n\n<p>Dans cette optique, ils ont cr\u00e9\u00e9 un outil qui donne un score de performance et fait des suggestions sur comment am\u00e9liorer ce score. Le test est valable \u00e0 la fois pour les ordinateurs et les mobiles.\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Qu\u2019est ce que PageSpeed Insights ?<\/h3>\n\n\n\n<p>Au fil des ann\u00e9es, PageSpeed Insights (en abr\u00e9g\u00e9 <em>PSI<\/em>) a \u00e9volu\u00e9 pour devenir l\u2019un des outils de test de performance les plus populaires. Ses scores sont facile \u00e0 lire, et les suggestions donn\u00e9es sont tr\u00e8s utiles pour comprendre ce qu\u2019il y a \u00e0 am\u00e9liorer sur votre site. <\/p>\n\n\n\n<p><strong>Notre <\/strong><a href=\"https:\/\/wp-rocket.me\/fr\/blog\/definition-page-speed-insigh\/\"><strong>guide 2019 pour PageSpeed Insights<\/strong><\/a><strong> vous guidera \u00e0 travers les secrets de cet outil indispensable et vous montrera comment en tirer le meilleur.\u00a0<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Les scores PageSpeed Insights : comment les lire et les comprendre au mieux<\/h3>\n\n\n\n<p>Le syst\u00e8me de notation au coeur de PageSpeed Insights est probablement l\u2019une des raisons de sa forte popularit\u00e9. <\/p>\n\n\n\n<p>Avec PSI, vous pouvez tr\u00e8s facilement avoir une id\u00e9e de l\u2019\u00e9tat de sant\u00e9 de votre site :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>La rond vert signifie que tout va bien.<\/li><li>Le carr\u00e9 orange signifie que vous devriez pr\u00eater attention \u00e0 quelque chose.<\/li><li>Le triangle rouge est le symbole redout\u00e9 qui signifie que quelque chose ne fonctionne pas comme il faudrait.\u00a0<\/li><\/ul>\n\n\n\n<p>Depuis fin 2018, les r\u00e9sultats de PageSpeed Insights se basent sur un autre outil de la famille Google : Lighthouse.<\/p>\n\n\n\n<p>Bien que le syst\u00e8me de notation n&rsquo;ait pas chang\u00e9 de pr\u00e9sentation, de nombreux m\u00e9canismes en arri\u00e8re-plan ont modifi\u00e9 la mani\u00e8re dont un rapport PSI doit \u00eatre interpr\u00e9t\u00e9. <\/p>\n\n\n\n<p><strong>C\u2019est pourquoi nous avons \u00e9crit un guide sur <a href=\"https:\/\/wp-rocket.me\/fr\/blog\/pagespeed-insights-est-maintenant-fourni-par-lighthouse-quest-ce-que-ca-change-et-comment-lire-le-nouveau-rapport\/\">comment lire le nouveau rapport de PageSpeed fourni par Lighthouse<\/a>.<\/strong><\/p>\n\n\n\n<p>D\u2019un autre c\u00f4t\u00e9, on ne le r\u00e9p\u00e8tera jamais assez : il est imp\u00e9ratif de <em>ne pas<\/em> utiliser PageSpeed Insights comme le seul outil d\u2019\u00e9valuation de la sant\u00e9 des performances de votre site web.<\/p>\n\n\n\n<p>Les scores PSI ne devraient pas vous inqui\u00e9ter outre mesure car ils ne sont pas LA v\u00e9rit\u00e9 universelle.<br><\/p>\n\n\n\n<p><strong>Notre guide sur <\/strong><a href=\"https:\/\/wp-rocket.me\/fr\/blog\/note-pagespeed-ne-compte-pas\/\"><strong>pourquoi vous ne devriez pas vous soucier des scores de PageSpeed<\/strong><\/a><strong> l\u2019explique en d\u00e9tails.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comment s\u2019occuper des recommandations de PageSpeed les plus courantes&nbsp;<\/h3>\n\n\n\n<p>Un rapport PageSpeed comprend g\u00e9n\u00e9ralement plusieurs suggestions. Mais si vous n\u2019\u00eates pas compl\u00e8tement familier avec le c\u00f4t\u00e9 technique du d\u00e9veloppement d\u2019un site web, ces suggestions peuvent vous para\u00eetre obscures, et vous ne saurez pas par quel bout les prendre. <\/p>\n\n\n\n<p><strong>Avec notre guide, <\/strong><a href=\"https:\/\/docs.google.com\/document\/d\/1uF5M5JwUK3vC8xLOKWiXV4gU6wybOahGQqCT_5Ut9Lw\/edit?usp=sharing\"><strong>les recommandations de Google PageSpeed Insights expliqu\u00e9es avec des mots simples<\/strong><\/a><strong> nous vous expliquons les bases pour comprendre les suggestions les plus courantes de PSI. <\/strong><\/p>\n\n\n\n<p>Nous verrons comment les interpr\u00e9ter, quelles sont les solutions les plus faciles \u00e0 mettre en place, et dans quels cas vous ne devriez pas vous en soucier. Par dessus tout, vous comprendrez pourquoi il est assez <strong>irr\u00e9aliste de viser un score de 100 % sur PageSpeed Insights<\/strong>.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les alternatives \u00e0 PageSpeed Insights : de GTMetrix \u00e0 Dareboost<\/h2>\n\n\n\n<p>Maintenant que vous connaissez tout ce qu\u2019il y a \u00e0 savoir sur PageSpeed Insights, vous pouvez vous int\u00e9resser \u00e0 ses alternatives. <\/p>\n\n\n\n<p>Il existe plusieurs excellents outils de test de vitesse, et l\u2019\u00e9quipe de WP Rocket en utilise certains au quotidien.&nbsp; <\/p>\n\n\n\n<p>Voici sept de nos outils pr\u00e9f\u00e9r\u00e9s : <\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><a href=\"https:\/\/tools.pingdom.com\">Pingdom Tools<\/a><\/li><li><a href=\"https:\/\/tools.pingdom.com\">GTMetrix<\/a><\/li><li><a href=\"https:\/\/www.webpagetest.org\/\">WebPageTest<\/a><\/li><li><a href=\"https:\/\/developers.google.com\/speed\/pagespeed\/insights\/\">PageSpeed Insights<\/a><\/li><li><a href=\"https:\/\/developers.google.com\/web\/tools\/chrome-devtools\/\">Google Chrome Dev Tools<\/a><\/li><li><a href=\"https:\/\/www.dareboost.com\/en\">Dareboost<\/a><\/li><li><a href=\"https:\/\/www.uptrends.com\">Uptrends<\/a><\/li><\/ol>\n\n\n\n<p>Vous pouvez vous amuser avec, comparer les r\u00e9sultats (en sachant que parfois, ils peuvent diff\u00e9rer), et apprendre comment tirer le meilleur parti de ces outils pour \u00e9valuer les performances r\u00e9elles de votre site. <\/p>\n\n\n\n<p><strong>Pour en savoir plus, allez voir notre <\/strong><a href=\"https:\/\/wp-rocket.me\/fr\/blog\/temps-chargement\/\"><strong>guide sur l\u2019optimisation de vitesse de page sur WordPress<\/strong><\/a><strong>.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comprendre GTMetrix, l\u2019une des meilleures alternatives \u00e0 PageSpeed Insights&nbsp;<\/h3>\n\n\n\n<p>GTMetrix est l\u2019une de nos alternatives pr\u00e9f\u00e9r\u00e9es \u00e0 PageSpeed Insights. Nous l\u2019utilisons r\u00e9guli\u00e8rement pour \u00e9valuer les performances des sites de nos clients. <\/p>\n\n\n\n<p>GTMetrix est un outil qui vous donnera une vue d\u2019ensemble de la vitesse de votre site.<\/p>\n\n\n\n<p>Il ne s\u2019appuie pas sur des scores, et commence par la mesure la plus fondamentale : <strong>le temps de chargement exprim\u00e9 en secondes. <\/strong>Cet indicateur, plus que toute autre note ou recommandation, est le v\u00e9ritable point de d\u00e9part de n\u2019importe quel test de performance. C\u2019est aussi un facteur de classement pour Google. <\/p>\n\n\n\n<p><strong>Dans notre guide sur comment <\/strong><a href=\"https:\/\/wp-rocket.me\/fr\/blog\/gtmetrix\/\"><strong>comprendre GTMetrix<\/strong><\/a><strong>, nous vous donnons tous les d\u00e9tails n\u00e9cessaires pour vous familiariser avec cet outil. <\/strong><\/p>\n\n\n\n<p>Vous verrez comment personnaliser votre rapport GTMetrix en fonction des caract\u00e9ristiques de l\u2019environnement de votre site. Il vous aidera aussi \u00e0 devenir un expert dans l\u2019interpr\u00e9tation de ses onglets et ses mesures.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment utiliser WP Rocket pour am\u00e9liorer votre score PageSpeed Insights&nbsp;<\/h2>\n\n\n\n<p>Lorsque vous apprenez comment utiliser les outils de test de performance pour \u00e9valuer la sant\u00e9 de votre site, vous vous munissez d\u2019un atout crucial. Une fois que vous avez compris comment lire les rapports, am\u00e9liorer les scores et s\u2019occuper des recommandations devient un jeu d\u2019enfant.&nbsp; <\/p>\n\n\n\n<p>WP Rocket est l\u2019un des outils qui vous aideront \u00e0 atteindre cet objectif de mani\u00e8re efficace et sans avoir \u00e0 vous inqui\u00e9ter de la configuration des fonctionnalit\u00e9s.<\/p>\n\n\n\n<p>Notre plugin est d\u00e9di\u00e9 \u00e0 la mise en cache et l\u2019optimisation. Apr\u00e8s l\u2019avoir install\u00e9, votre site b\u00e9n\u00e9ficiera <strong>imm\u00e9diatement et automatiquement de 80 % des meilleures pratiques de performance web<\/strong>, telles que :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>La mise en cache de page<\/li><li>La mise en cache de navigateur<\/li><li>La compression GZIP<\/li><\/ul>\n\n\n\n<p>PageSpeed Insights appr\u00e9cie beaucoup ces pratiques et r\u00e9compensera votre site imm\u00e9diatement en am\u00e9liorant son score de performance. <\/p>\n\n\n\n<p>Vous avez \u00e9galement les fonctionnalit\u00e9s <em>optionnelles<\/em> de WP Rocket. Elles ne sont pas obligatoires car votre site sera d\u00e9j\u00e0 plus rapide m\u00eame sans les essayer. <\/p>\n\n\n\n<p>La bonne utilisation de ces fonctionnalit\u00e9s rendra non seulement votre site extr\u00eamement rapide, mais cela am\u00e9liorera \u00e9galement ses performances de mani\u00e8re significative. Cela augmentera votre<strong> vitesse de page<\/strong>, votre<strong> classement SEO<\/strong>, et vous permettra d\u2019obtenir les <strong>meilleurs scores de PageSpeed Insights<\/strong>. (ou d\u2019autres outils de performance) <\/p>\n\n\n\n<p>La plupart des options de WP Rocket qui rendront PageSpeed Insights fou de votre site sont dans l\u2019onglet <em>optimisation de fichier.&nbsp;<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"994\" height=\"433\" src=\"https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/WP-Rocket-File-Optimization-Tab.png\" alt=\"WP Rocket File Optimization Tab\" class=\"wp-image-1313499\" srcset=\"https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/WP-Rocket-File-Optimization-Tab.png 994w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/WP-Rocket-File-Optimization-Tab-300x131.png 300w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/WP-Rocket-File-Optimization-Tab-768x335.png 768w\" sizes=\"auto, (max-width: 994px) 100vw, 994px\" \/><figcaption>Onglet optimisation de fichier de WP Rocket<\/figcaption><\/figure>\n\n\n\n<p>Ces options concernent la <strong>minification<\/strong>, la <strong>concat\u00e9nation<\/strong>, et le <strong>chargement d\u00e9ferr\u00e9 des fichiers CSS et JavaScript. <\/strong><\/p>\n\n\n\n<p>PageSpeed Insights est tr\u00e8s sensible \u00e0 la mani\u00e8re dont les fichiers se chargent sur une page. Certaines de ses recommandations les plus d\u00e9licates s\u2019appellent <em>Eliminer les ressources bloquants le rendu<\/em>, et <em>diff\u00e9rer le CSS non utilis\u00e9. <\/em><\/p>\n\n\n\n<p>Ces recommandations font r\u00e9f\u00e9rence au d\u00e9lai (diff\u00e9rer) de chargement des fichiers non-critiques jusqu\u2019\u00e0 ce que le navigateur ait fini d\u2019afficher la page. <\/p>\n\n\n\n<p>WP Rocket vous aide \u00e0 r\u00e9soudre ce casse-t\u00eate gr\u00e2ce \u00e0 ses options sous l\u2019onglet<em> <\/em><a href=\"https:\/\/docs.wp-rocket.me\/article\/108-render-blocking-javascript-and-css-pagespeed#critical-path-css\"><em>Optimize CSS Delivery<\/em><\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"483\" src=\"https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Optimize-CSS-Delivery-1.png\" alt=\"Optimize CSS Delivery Option\" class=\"wp-image-1313687\" srcset=\"https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Optimize-CSS-Delivery-1.png 600w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Optimize-CSS-Delivery-1-300x242.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption>Onglet Optimize CSS Delivery de WP Rocket<\/figcaption><\/figure>\n\n\n\n<p>Pour les fichiers JavaScript, vous pouvez utiliser l\u2019option <a href=\"https:\/\/docs.wp-rocket.me\/article\/108-render-blocking-javascript-and-css-pagespeed#deferred-js\"><em>Load JavaScript deferred<\/em><\/a> :<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"541\" height=\"546\" src=\"https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Load-JavaScript-Deferred.jpg\" alt=\"Load JavaScript Deferred\" class=\"wp-image-1313702\" srcset=\"https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Load-JavaScript-Deferred.jpg 541w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Load-JavaScript-Deferred-150x150.jpg 150w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Load-JavaScript-Deferred-297x300.jpg 297w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Load-JavaScript-Deferred-300x303.jpg 300w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Load-JavaScript-Deferred-100x100.jpg 100w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Load-JavaScript-Deferred-108x108.jpg 108w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/Load-JavaScript-Deferred-80x80.jpg 80w\" sizes=\"auto, (max-width: 541px) 100vw, 541px\" \/><figcaption>Option Load JavaScript deferred de WP Rocket<\/figcaption><\/figure>\n\n\n\n<p>D\u2019un autre c\u00f4t\u00e9, l\u2019onglet <em>Media <\/em>contient les options qui s\u2019occuperont des recommandations de PSI li\u00e9es aux images, comme <em>Diff\u00e9rer les images hors \u00e9cran<\/em>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"948\" height=\"490\" src=\"https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/WP-Rocket-Media-LazyLoad.png\" alt=\"WP Rocket Media LazyLoad\" class=\"wp-image-1313519\" srcset=\"https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/WP-Rocket-Media-LazyLoad.png 948w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/WP-Rocket-Media-LazyLoad-300x155.png 300w, https:\/\/wp-rocket.me\/wp-content\/uploads\/1\/WP-Rocket-Media-LazyLoad-768x397.png 768w\" sizes=\"auto, (max-width: 948px) 100vw, 948px\" \/><figcaption>Onglet Media de WP Rocket<\/figcaption><\/figure>\n\n\n\n<p>Avec WP Rocket, nous aspirons \u00e0 rendre le web un endroit plus viable avec des pages web plus rapides avec de meilleures performances.&nbsp;&nbsp;<br><\/p>\n\n\n\n<p>Allez jeter un oeil \u00e0 ses <a href=\"https:\/\/wp-rocket.me\/features\/\">fonctionnalit\u00e9s<\/a>, <a href=\"https:\/\/wp-rocket.me\/pricing\/\">nos offres et leurs prix<\/a>, et voyez comment la vitesse de votre site peut fuser vers les \u00e9toiles !&nbsp;<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvrez tous les secrets de PageSpeed Insights by Google : comment l&rsquo;utiliser et comprendre ses r\u00e9sultats, comment fixer ses recommandations et ses meilleures alternatives.<\/p>\n","protected":false},"author":9832,"featured_media":1534169,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"kia_subtitle":"","footnotes":""},"categories":[73],"tags":[],"class_list":["post-1804776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cache-wordpress"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le guide ultime de PageSpeed Insights by Google<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez tous les secrets de PageSpeed Insights by Google : comment 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