{"id":5384,"date":"2021-03-27T14:48:18","date_gmt":"2021-03-27T13:48:18","guid":{"rendered":"https:\/\/www.yateo.com\/blog\/?p=5384"},"modified":"2022-10-15T22:47:58","modified_gmt":"2022-10-15T20:47:58","slug":"comment-ameliorer-time-to-first-byte","status":"publish","type":"post","link":"https:\/\/www.yateo.com\/blog\/comment-ameliorer-time-to-first-byte","title":{"rendered":"Comment am\u00e9liorer son Time To First Byte (TTFB) en vue d\u2019am\u00e9liorer les performances de chargement de son site ?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Beaucoup de propri\u00e9taires de sites souhaitent avoir un site Internet rapide \u00e0 charger mais peu y parviennent en v\u00e9rit\u00e9. Beaucoup rencontrent des difficult\u00e9s pour acc\u00e9l\u00e9rer les performances de leur site. <\/span><\/p>\n<p><!--more--><\/p>\n<p><span style=\"font-weight: 400;\">La vitesse de chargement est en effet un sujet complexe qui n\u00e9cessite de concilier plusieurs expertises : le <a href=\"https:\/\/www.yateo.com\/agencedereferencement.html\">SEO<\/a> bien s\u00fbr, l\u2019UX mais \u00e9galement toute la partie Admin serveur. Le temps de chargement des pages d\u2019un site web demeure un sujet universel d\u00e8s lors qu\u2019il affecte l\u2019exp\u00e9rience utilisateur, ce qui a un impact direct sur le business du site Internet comme l\u2019a si bien d\u00e9montr\u00e9 Amazon. Le test indiquait que 100ms de temps de chargement en plus repr\u00e9sentait 1% de ventes en moins. Ce doit donc \u00eatre pris tr\u00e8s au s\u00e9rieux, d\u2019autant plus sur les terminaux mobiles dont le trafic g\u00e9n\u00e9r\u00e9 d\u00e9passe les 50% sur un site en moyenne. \u00c0 ce sujet, nous vous invitons \u00e0 lire cette <\/span><a href=\"https:\/\/www.thinkwithgoogle.com\/intl\/fr-fr\/strategies-marketing\/mobile-et-apps\/vitesse-de-chargement-des-pages-mobiles-ou-se-situe-votre-site\/\"><span style=\"font-weight: 400;\">\u00e9tude r\u00e9alis\u00e9e par Google lui-m\u00eame sur la vitesse de chargement des pages mobiles<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Mais, en r\u00e9alit\u00e9 ? C\u2019est quoi un site rapide \u00e0 charger ?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Dans l\u2019id\u00e9al, on estime qu\u2019<\/span><b>un site rapide doit se charger en moins de deux secondes<\/b><span style=\"font-weight: 400;\">. Au-del\u00e0, l\u2019internaute ressent d\u00e9j\u00e0 de l\u2019impatience et risque de quitter pr\u00e9matur\u00e9ment votre site sans m\u00eame avoir visit\u00e9 une seule page.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Afin d\u2019\u00e9valuer le taux de latence d\u2019une page, on se base g\u00e9n\u00e9ralement sur le <\/span><b>TTFB<\/b><span style=\"font-weight: 400;\"> (<\/span><b>Time To First Byte<\/b><span style=\"font-weight: 400;\">), un indicateur important qui permet de <\/span><b>mesurer le temps de r\u00e9ponse serveur<\/b><span style=\"font-weight: 400;\">, c\u2019est-\u00e0-dire le temps n\u00e9cessaire pour un serveur \u00e0 renvoyer le premier octet suite \u00e0 une requ\u00eate client (navigateur). Cet indicateur permet de prendre connaissance de la performance de votre serveur \u00e0 r\u00e9pondre rapidement.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Le calcul du TTFB inclut :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">La<\/span><b> mise en attente de la requ\u00eate par le navigateur<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">La<\/span><b> recherche DNS<\/b><span style=\"font-weight: 400;\">: le temps pass\u00e9 \u00e0 effectuer la recherche DNS (conversion du nom de domaine en adresse IP)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u2019envoi de la requ\u00eate au serveur<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Le <\/span><b>traitement de la requ\u00eate par le serveur<\/b><span style=\"font-weight: 400;\"> et le <\/span><b>temps d\u2019attente avant envoi du premier octet au navigateur<\/b><span style=\"font-weight: 400;\"> : c\u2019est \u00e0 cette \u00e9tape qu\u2019intervient le TTFB.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">C\u2019est \u00e0 l\u2019issue de ces principales \u00e9tapes qu\u2019on obtient le Time To First Byte qui, selon Google, doit \u00eatre de 200 ms maximum, ce qui est tr\u00e8s difficile \u00e0 atteindre dans les faits.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Comment am\u00e9liorer son TTFB ?<\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5547 size-full\" src=\"https:\/\/www.yateo.com\/blog\/wp-content\/uploads\/2021\/03\/Article.png\" alt=\"\" width=\"960\" height=\"608\" srcset=\"https:\/\/www.yateo.com\/blog\/wp-content\/uploads\/2021\/03\/Article.png 960w, https:\/\/www.yateo.com\/blog\/wp-content\/uploads\/2021\/03\/Article-300x190.png 300w, https:\/\/www.yateo.com\/blog\/wp-content\/uploads\/2021\/03\/Article-768x486.png 768w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Ci-dessous, voici quelques <\/span><b>conseils pour optimiser le temps d\u2019affichage de vos pages web<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Utilisez un CDN (Content Delivery Network)<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Un <\/span><b>CDN<\/b><span style=\"font-weight: 400;\"> ou <\/span><b>r\u00e9seau de diffusion de contenu<\/b><span style=\"font-weight: 400;\"> met en r\u00e9seau plusieurs serveurs \u00e0 travers le monde, ce qui permet \u00e0 votre site de s\u2019afficher plus rapidement quelle que soit la localisation de l\u2019internaute. Ainsi, votre serveur se situe toujours au plus proche de la requ\u00eate des internautes. Le CDN se pr\u00eate ainsi parfaitement aux sites multilingues.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Activer la mise en cache de vos ressources statiques<\/span><\/h3>\n<p><b>Mettez en cache votre contenu statique<\/b><span style=\"font-weight: 400;\"> (images, CSS, JS\u2026) afin de diminuer les \u00e9changes de requ\u00eates entre le navigateur et le serveur de votre site dans le cas o\u00f9 les internautes sont d\u00e9j\u00e0 venus au moins une fois sur votre site et ont \u00e9t\u00e9 identifi\u00e9s comme tel. La mise en cache permet de renvoyer des \u00e9l\u00e9ments pr\u00e9charg\u00e9s \u00e0 votre navigateur. \u00c0 utiliser si votre site n\u2019est pas mis \u00e0 jour trop souvent.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Diff\u00e9rez l\u2019analyse de certains fichiers qui ne nuisent pas \u00e0 l\u2019affichage de votre site<\/span><\/h3>\n<p><b>Retardez la prise en compte des scripts <\/b><span style=\"font-weight: 400;\">qui prennent en charge les actions de l&rsquo;utilisateur qui ne sont utiles qu&rsquo;apr\u00e8s le chargement complet de la page.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Optimisez le nombre et le poids des requ\u00eates \u00e0 la base de donn\u00e9es ou via des services tiers<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Pour diminuer les temps de latence, <\/span><b>r\u00e9duisez au strict minimum les appels \u00e0 la base de donn\u00e9es et limitez les appels \u00e0 des services tiers<\/b><span style=\"font-weight: 400;\"> qui n\u00e9cessitent des allers-retours et des temps de calcul qui impactent directement le TTFB.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">R\u00e9duisez le nombre de requ\u00eates HTTP<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Pour diminuer encore davantage le TTFB, vous pouvez <\/span><b>regrouper les fichiers CSS<\/b><span style=\"font-weight: 400;\">, <\/span><b>combiner les fichiers JavaScript<\/b><span style=\"font-weight: 400;\"> en les rendant asynchrone et rassembler vos images dans un seul fichier par le biais des <\/span><b>sprites CSS<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Compressez et minifiez vos ressources<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Sur Internet, inutile d\u2019avoir des images de plusieurs m\u00e9gas \u00e0 donner \u00e0 charger au navigateur. Aussi, <\/span><b>pensez toujours \u00e0 compresser vos images<\/b><span style=\"font-weight: 400;\"> afin de r\u00e9duire leur poids, avant int\u00e9gration sur le serveur. Parall\u00e8lement, <\/span><b>minifiez vos fichiers JS et CSS<\/b><span style=\"font-weight: 400;\">, surtout s\u2019ils sont volumineux, afin de gagner l\u00e0 encore quelques octets au moment du t\u00e9l\u00e9chargement de vos fichiers.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Beaucoup de propri\u00e9taires de sites souhaitent avoir un site Internet rapide \u00e0 charger mais peu y parviennent en v\u00e9rit\u00e9. Beaucoup rencontrent des difficult\u00e9s pour acc\u00e9l\u00e9rer les performances de leur site.<\/p>\n","protected":false},"author":4,"featured_media":6535,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-5384","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-referencement_naturel","has-featured-image"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>TTFB : comment analyser et r\u00e9duire son Time to First Byte ? | YATEO<\/title>\n<meta name=\"description\" content=\"Comment am\u00e9liorer le temps de chargement des pages de son site et, plus sp\u00e9cifiquement, le TTFB (Time To First Byte) ? 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