{"id":23820,"date":"2026-08-13T03:05:00","date_gmt":"2026-08-13T00:05:00","guid":{"rendered":"https:\/\/www.cenuta.com\/blog\/?p=23820"},"modified":"2026-08-13T03:05:01","modified_gmt":"2026-08-13T00:05:01","slug":"tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026","status":"publish","type":"post","link":"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/","title":{"rendered":"TBT (Total Blocking Time) Nedir? Sayfa H\u0131z\u0131n\u0131 ve TBT Skorunu \u0130yile\u015ftirme Rehberi (2026)"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7indekiler<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a81e256109ac\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a81e256109ac\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#Giris_Tikliyorum_Ama_Calismiyor_Sendromu\" title=\"Giri\u015f: T\u0131kl\u0131yorum Ama \u00c7al\u0131\u015fm\u0131yor Sendromu\">Giri\u015f: T\u0131kl\u0131yorum Ama \u00c7al\u0131\u015fm\u0131yor Sendromu<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#Gelisme_TBTnin_Anatomisi_ve_Tarayici_Calisma_Mantigi\" title=\"Geli\u015fme: TBT&#8217;nin Anatomisi ve Taray\u0131c\u0131 \u00c7al\u0131\u015fma Mant\u0131\u011f\u0131\">Geli\u015fme: TBT&#8217;nin Anatomisi ve Taray\u0131c\u0131 \u00c7al\u0131\u015fma Mant\u0131\u011f\u0131<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#Ana_Is_Parcacigi_Main_Thread_ve_Uzun_Gorevler_Long_Tasks\" title=\"Ana \u0130\u015f Par\u00e7ac\u0131\u011f\u0131 (Main Thread) ve Uzun G\u00f6revler (Long Tasks)\">Ana \u0130\u015f Par\u00e7ac\u0131\u011f\u0131 (Main Thread) ve Uzun G\u00f6revler (Long Tasks)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#TBT_Nasil_Hesaplanir\" title=\"TBT Nas\u0131l Hesaplan\u0131r?\">TBT Nas\u0131l Hesaplan\u0131r?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#TBT_FID_ve_INP_Arasindaki_Iliski\" title=\"TBT, FID ve INP Aras\u0131ndaki \u0130li\u015fki\">TBT, FID ve INP Aras\u0131ndaki \u0130li\u015fki<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#TBT_Skorunu_Hangi_Faktorler_Yukseltir_Kotulestirir\" title=\"TBT Skorunu Hangi Fakt\u00f6rler Y\u00fckseltir (K\u00f6t\u00fcle\u015ftirir)?\">TBT Skorunu Hangi Fakt\u00f6rler Y\u00fckseltir (K\u00f6t\u00fcle\u015ftirir)?<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#1_Gereksiz_ve_Agir_JavaScript_Yukleri\" title=\"1. Gereksiz ve A\u011f\u0131r JavaScript Y\u00fckleri\">1. Gereksiz ve A\u011f\u0131r JavaScript Y\u00fckleri<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#2_Dis_Kaynakli_Third-Party_Scriptlerin_Hukmu\" title=\"2. D\u0131\u015f Kaynakl\u0131 (Third-Party) Scriptlerin H\u00fckm\u00fc\">2. D\u0131\u015f Kaynakl\u0131 (Third-Party) Scriptlerin H\u00fckm\u00fc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#3_DOM_Boyutunun_Asiri_Buyumesi\" title=\"3. DOM Boyutunun A\u015f\u0131r\u0131 B\u00fcy\u00fcmesi\">3. DOM Boyutunun A\u015f\u0131r\u0131 B\u00fcy\u00fcmesi<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#TBT_Degerini_Iyilestirmek_Icin_Kesin_Optimizasyon_Cozumleri\" title=\"TBT De\u011ferini \u0130yile\u015ftirmek \u0130\u00e7in Kesin Optimizasyon \u00c7\u00f6z\u00fcmleri\">TBT De\u011ferini \u0130yile\u015ftirmek \u0130\u00e7in Kesin Optimizasyon \u00c7\u00f6z\u00fcmleri<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#1_JavaScript_Dosyalarini_Erteleyin_Defer_ve_Asenkronize_Edin_Async\" title=\"1. JavaScript Dosyalar\u0131n\u0131 Erteleyin (Defer) ve Asenkronize Edin (Async)\">1. JavaScript Dosyalar\u0131n\u0131 Erteleyin (Defer) ve Asenkronize Edin (Async)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#2_Dis_Kaynakli_Kodlari_Geciktirin_Delay_JS_Execution\" title=\"2. D\u0131\u015f Kaynakl\u0131 Kodlar\u0131 Geciktirin (Delay JS Execution)\">2. D\u0131\u015f Kaynakl\u0131 Kodlar\u0131 Geciktirin (Delay JS Execution)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#3_Uzun_Gorevleri_Parcalara_Ayirin_Code_Splitting\" title=\"3. Uzun G\u00f6revleri Par\u00e7alara Ay\u0131r\u0131n (Code Splitting)\">3. Uzun G\u00f6revleri Par\u00e7alara Ay\u0131r\u0131n (Code Splitting)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#4_Web_Workers_Teknolojisini_Kullanin\" title=\"4. Web Workers Teknolojisini Kullan\u0131n\">4. Web Workers Teknolojisini Kullan\u0131n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#5_Gereksiz_Eklentileri_ve_Siskinligi_Bloat_Temizleyin\" title=\"5. Gereksiz Eklentileri ve \u015ei\u015fkinli\u011fi (Bloat) Temizleyin\">5. Gereksiz Eklentileri ve \u015ei\u015fkinli\u011fi (Bloat) Temizleyin<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/#Sonuc_Etkilesim_Dijital_Sadakatin_Temelidir\" title=\"Sonu\u00e7: Etkile\u015fim, Dijital Sadakatin Temelidir\">Sonu\u00e7: Etkile\u015fim, Dijital Sadakatin Temelidir<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Giris_Tikliyorum_Ama_Calismiyor_Sendromu\"><\/span>Giri\u015f: T\u0131kl\u0131yorum Ama \u00c7al\u0131\u015fm\u0131yor Sendromu<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u0130nternette gezinirken hepimizin ba\u015f\u0131na gelmi\u015f sinir bozucu bir senaryo vard\u0131r: \u0130lginizi \u00e7eken bir web sitesine girersiniz, sayfa ekranda \u00e7ok h\u0131zl\u0131 bir \u015fekilde belirir, resimler ve metinler saniyeler i\u00e7inde y\u00fcklenir. &#8220;Harika, site a\u00e7\u0131ld\u0131!&#8221; diye d\u00fc\u015f\u00fcn\u00fcp bir butona, men\u00fcye veya bir ba\u011flant\u0131ya t\u0131klamaya \u00e7al\u0131\u015f\u0131rs\u0131n\u0131z; ancak site hi\u00e7bir tepki vermez. Ekran donmu\u015f gibidir, kayd\u0131rma (scroll) yapmaya \u00e7al\u0131\u015f\u0131rs\u0131n\u0131z sayfa tak\u0131larak hareket eder. \u0130\u015fte bir web sitesinin g\u00f6rsel olarak y\u00fcklenmi\u015f gibi g\u00f6r\u00fcn\u00fcp arka planda kullan\u0131c\u0131n\u0131n komutlar\u0131na yan\u0131t veremedi\u011fi o fel\u00e7 edici zaman diliminin teknik kar\u015f\u0131l\u0131\u011f\u0131 <strong>TBT (Total Blocking Time &#8211; Toplam Engelleme S\u00fcresi)<\/strong> olarak adland\u0131r\u0131l\u0131r.<\/p>\n\n\n\n<p>2026 y\u0131l\u0131n\u0131n rekabet\u00e7i SEO (Arama Motoru Optimizasyonu) d\u00fcnyas\u0131nda, Google&#8217;\u0131n Core Web Vitals (\u00d6nemli Web Verileri) metrikleri art\u0131k sadece &#8220;Sayfa ne kadar s\u00fcrede a\u00e7\u0131ld\u0131?&#8221; sorusuyla ilgilenmez. &#8220;Sayfa a\u00e7\u0131ld\u0131\u011f\u0131nda kullan\u0131c\u0131yla ne kadar s\u00fcrede etkile\u015fime girebildi?&#8221; sorusu s\u0131ralamalar\u0131 belirleyen en kritik fakt\u00f6rlerden biri haline gelmi\u015ftir. \u00c7\u00fcnk\u00fc kullan\u0131c\u0131lar, t\u0131klay\u0131p yan\u0131t alamad\u0131klar\u0131 bir siteyi ortalama 3 saniye i\u00e7inde terk etmektedir (Bounce Rate).<\/p>\n\n\n\n<p>Bu derinlemesine rehberde; web performans\u0131n\u0131n sessiz katili olan TBT metri\u011finin tam olarak ne anlama geldi\u011fini, taray\u0131c\u0131lar\u0131n &#8220;Ana \u0130\u015f Par\u00e7ac\u0131\u011f\u0131&#8221; (Main Thread) mimarisini nas\u0131l t\u0131kad\u0131\u011f\u0131n\u0131, TBT&#8217;yi nas\u0131l \u00f6l\u00e7ece\u011finizi ve sitenizi bu a\u011f\u0131r y\u00fckten kurtaracak teknik optimizasyon stratejilerini t\u00fcm \u015feffafl\u0131\u011f\u0131yla inceliyoruz.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gelisme_TBTnin_Anatomisi_ve_Tarayici_Calisma_Mantigi\"><\/span>Geli\u015fme: TBT&#8217;nin Anatomisi ve Taray\u0131c\u0131 \u00c7al\u0131\u015fma Mant\u0131\u011f\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>TBT (Total Blocking Time), sayfan\u0131n ilk metin veya g\u00f6rsel i\u00e7eri\u011finin ekranda belirdi\u011fi an (First Contentful Paint &#8211; FCP) ile sayfan\u0131n kullan\u0131c\u0131 etkile\u015fimlerine tamamen haz\u0131r hale geldi\u011fi an (Time to Interactive &#8211; TTI) aras\u0131nda ge\u00e7en s\u00fcrede, taray\u0131c\u0131n\u0131n kullan\u0131c\u0131 yan\u0131tlar\u0131n\u0131 engelleyecek kadar me\u015fgul oldu\u011fu toplam s\u00fcreyi milisaniye (ms) cinsinden \u00f6l\u00e7er.<\/p>\n\n\n\n<p>Bu tan\u0131m\u0131 tam olarak kavrayabilmek i\u00e7in taray\u0131c\u0131lar\u0131n (Chrome, Firefox, Safari vb.) kodlar\u0131 nas\u0131l i\u015fledi\u011fine, yani &#8220;Ana \u0130\u015f Par\u00e7ac\u0131\u011f\u0131&#8221; kavram\u0131na yak\u0131ndan bakmal\u0131y\u0131z.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ana_Is_Parcacigi_Main_Thread_ve_Uzun_Gorevler_Long_Tasks\"><\/span>Ana \u0130\u015f Par\u00e7ac\u0131\u011f\u0131 (Main Thread) ve Uzun G\u00f6revler (Long Tasks)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u0130nternet taray\u0131c\u0131lar\u0131, bir web sitesini ekrana \u00e7izerken HTML&#8217;i okumak, CSS&#8217;i yorumlay\u0131p tasar\u0131ma d\u00f6kmek ve JavaScript kodlar\u0131n\u0131 \u00e7al\u0131\u015ft\u0131rmak zorundad\u0131r. Taray\u0131c\u0131n\u0131n t\u00fcm bu i\u015fleri yapt\u0131\u011f\u0131 tek \u015feritli bir otoyol vard\u0131r; bu yola <strong>Ana \u0130\u015f Par\u00e7ac\u0131\u011f\u0131 (Main Thread)<\/strong> denir.<\/p>\n\n\n\n<p>Ana i\u015f par\u00e7ac\u0131\u011f\u0131 ayn\u0131 anda sadece bir i\u015fi yapabilir. E\u011fer taray\u0131c\u0131, a\u011f\u0131r bir JavaScript dosyas\u0131n\u0131 \u00e7al\u0131\u015ft\u0131rmakla me\u015fgulse, o an kullan\u0131c\u0131n\u0131n ekrandaki bir butona t\u0131klamas\u0131n\u0131 veya sayfay\u0131 kayd\u0131rmas\u0131n\u0131 i\u015fleme alamaz. Kullan\u0131c\u0131 t\u0131klasa bile, taray\u0131c\u0131 &#8220;\u015eu an me\u015fgul\u00fcm, elimdeki i\u015fi bitirene kadar bekle&#8221; der.<\/p>\n\n\n\n<p>Performans \u00f6l\u00e7\u00fcm laboratuvarlar\u0131nda (Lighthouse), ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 <strong>50 milisaniyeden (ms) daha uzun s\u00fcre<\/strong> me\u015fgul eden her i\u015fleme <strong>&#8220;Uzun G\u00f6rev&#8221; (Long Task)<\/strong> ad\u0131 verilir. 50 ms&#8217;nin alt\u0131ndaki g\u00f6revler insan g\u00f6z\u00fc ve alg\u0131s\u0131 taraf\u0131ndan &#8220;anl\u0131k&#8221; olarak hissedildi\u011fi i\u00e7in sorun yaratmaz.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"TBT_Nasil_Hesaplanir\"><\/span>TBT Nas\u0131l Hesaplan\u0131r?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>TBT&#8217;nin hesaplanma mant\u0131\u011f\u0131 olduk\u00e7a basittir. 50 ms&#8217;yi a\u015fan her &#8220;Uzun G\u00f6rev&#8221;, engelleme s\u00fcresine katk\u0131da bulunur. Sadece 50 ms&#8217;nin <strong>\u00fczerindeki<\/strong> k\u0131s\u0131m hesaplamaya dahil edilir.<\/p>\n\n\n\n<p><strong>\u00d6rnek Senaryo:<\/strong> Aray\u00fcz geli\u015ftiricisi <strong>Altu\u011f<\/strong>, e-ticaret sitesi i\u00e7in karma\u015f\u0131k bir filtreleme mod\u00fcl\u00fc kodlam\u0131\u015ft\u0131r. Site y\u00fcklendi\u011finde taray\u0131c\u0131 arka planda \u00fc\u00e7 farkl\u0131 JavaScript g\u00f6revi \u00e7al\u0131\u015ft\u0131r\u0131r:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>G\u00f6rev: 30 ms s\u00fcrer. (50 ms&#8217;nin alt\u0131nda oldu\u011fu i\u00e7in TBT&#8217;ye katk\u0131s\u0131 0 ms&#8217;dir.)<\/li>\n\n\n\n<li>G\u00f6rev: 120 ms s\u00fcrer. (Kullan\u0131c\u0131y\u0131 engelleyen k\u0131s\u0131m: 120 &#8211; 50 = <strong>70 ms<\/strong>.)<\/li>\n\n\n\n<li>G\u00f6rev: 80 ms s\u00fcrer. (Kullan\u0131c\u0131y\u0131 engelleyen k\u0131s\u0131m: 80 &#8211; 50 = <strong>30 ms<\/strong>.)<\/li>\n<\/ol>\n\n\n\n<p>Bu durumda, Altu\u011f&#8217;un sayfas\u0131n\u0131n TBT de\u011feri: 70 ms + 30 ms = <strong>100 milisaniyedir.<\/strong><\/p>\n\n\n\n<p>Google&#8217;\u0131n performans standartlar\u0131na g\u00f6re TBT skorlar\u0131n\u0131n de\u011ferlendirmesi \u015f\u00f6yledir:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>M\u00fckemmel (Ye\u015fil):<\/strong> 0 &#8211; 200 ms aras\u0131<\/li>\n\n\n\n<li><strong>\u0130yile\u015ftirme Gerekiyor (Sar\u0131):<\/strong> 200 &#8211; 600 ms aras\u0131<\/li>\n\n\n\n<li><strong>Zay\u0131f (K\u0131rm\u0131z\u0131):<\/strong> 600 ms ve \u00fczeri<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"TBT_FID_ve_INP_Arasindaki_Iliski\"><\/span>TBT, FID ve INP Aras\u0131ndaki \u0130li\u015fki<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Web performans metriklerini incelerken \u00e7ok say\u0131da k\u0131saltmayla kar\u015f\u0131la\u015f\u0131rs\u0131n\u0131z. TBT, do\u011frudan bir <strong>Laboratuvar Metri\u011fidir (Lab Data)<\/strong>. Yani Google PageSpeed Insights veya Lighthouse gibi ara\u00e7lar\u0131n, yapay bir ortamda sitenizi test ederken \u00fcretti\u011fi teorik bir puand\u0131r. Ger\u00e7ek kullan\u0131c\u0131lar\u0131n sahada ya\u015fad\u0131\u011f\u0131 deneyimi \u00f6l\u00e7en metrik ise 2024 y\u0131l\u0131na kadar FID (First Input Delay) iken, modern algoritmalarda yerini \u00e7ok daha kapsaml\u0131 olan <strong>INP (Interaction to Next Paint)<\/strong> metri\u011fine b\u0131rakm\u0131\u015ft\u0131r.<\/p>\n\n\n\n<p>TBT skoru k\u00f6t\u00fcyse, sahada \u00f6l\u00e7\u00fclen INP skorunun da (ger\u00e7ek kullan\u0131c\u0131n\u0131n t\u0131klama gecikmesi) k\u00f6t\u00fc olmas\u0131 ka\u00e7\u0131n\u0131lmazd\u0131r. TBT&#8217;yi iyile\u015ftirmek, do\u011frudan INP skorunuzu ye\u015fil b\u00f6lgeye ta\u015f\u0131yacakt\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"TBT_Skorunu_Hangi_Faktorler_Yukseltir_Kotulestirir\"><\/span>TBT Skorunu Hangi Fakt\u00f6rler Y\u00fckseltir (K\u00f6t\u00fcle\u015ftirir)?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Web sayfan\u0131z\u0131n &#8220;kilitlenip kalmas\u0131na&#8221; neden olan ba\u015fl\u0131ca mimari hatalar ve dijital obezite sorunlar\u0131 \u015funlard\u0131r:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Gereksiz_ve_Agir_JavaScript_Yukleri\"><\/span>1. Gereksiz ve A\u011f\u0131r JavaScript Y\u00fckleri<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Sitenize ekledi\u011finiz her bir dinamik \u00f6\u011fe (Sliderlar, pop-uplar, karma\u015f\u0131k animasyonlar) JavaScript ile \u00e7al\u0131\u015f\u0131r. Bu dosyalar\u0131n s\u0131k\u0131\u015ft\u0131r\u0131lmadan (minify) veya sayfan\u0131n ihtiyac\u0131 olmayan kodlarla dolu bir \u015fekilde (dead code) taray\u0131c\u0131ya g\u00f6nderilmesi, ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 saniyelerce rehin al\u0131r.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Dis_Kaynakli_Third-Party_Scriptlerin_Hukmu\"><\/span>2. D\u0131\u015f Kaynakl\u0131 (Third-Party) Scriptlerin H\u00fckm\u00fc<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Dijital pazarlama uzman\u0131 <strong>Berrin<\/strong>, y\u00f6netti\u011fi i\u00e7erik sitesine ziyaret\u00e7ileri takip edebilmek i\u00e7in Google Analytics, Facebook Pixel, Hotjar \u0131s\u0131 haritas\u0131, canl\u0131 destek arac\u0131 ve \u00fc\u00e7 farkl\u0131 reklam a\u011f\u0131 kodu eklemi\u015ftir. Kullan\u0131c\u0131 siteye girdi\u011finde, Berrin&#8217;in kendi sunucusundan gelen i\u00e7erik hemen y\u00fcklenir; ancak o s\u0131rada d\u0131\u015f kaynaklardan gelen bu takip kodlar\u0131 ayn\u0131 anda devreye girip \u00e7al\u0131\u015fmaya ba\u015flar. Ana i\u015f par\u00e7ac\u0131\u011f\u0131 bu d\u0131\u015f scriptleri i\u015flemekten, kullan\u0131c\u0131n\u0131n t\u0131klamalar\u0131na yan\u0131t veremez hale gelir. D\u0131\u015f kaynakl\u0131 kodlar, y\u00fcksek TBT skorlar\u0131n\u0131n %80&#8217;inin bir numaral\u0131 sorumlusudur.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_DOM_Boyutunun_Asiri_Buyumesi\"><\/span>3. DOM Boyutunun A\u015f\u0131r\u0131 B\u00fcy\u00fcmesi<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>DOM (Document Object Model), bir web sayfas\u0131n\u0131n HTML iskeletidir. Sayfada ne kadar \u00e7ok HTML etiketi (div, span vb.) varsa, taray\u0131c\u0131n\u0131n o iskeleti olu\u015fturmas\u0131 ve JavaScript&#8217;in o iskelet i\u00e7indeki bir elementi bulup de\u011fi\u015ftirmesi o kadar uzun s\u00fcrer. Tasar\u0131mc\u0131lar\u0131n pratik buldu\u011fu ancak kod taraf\u0131nda y\u00fczlerce i\u00e7 i\u00e7e ge\u00e7mi\u015f klas\u00f6r yaratan baz\u0131 &#8220;Sayfa Olu\u015fturucu&#8221; (Page Builder) eklentileri devasa DOM boyutlar\u0131na yol a\u00e7ar.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"TBT_Degerini_Iyilestirmek_Icin_Kesin_Optimizasyon_Cozumleri\"><\/span>TBT De\u011ferini \u0130yile\u015ftirmek \u0130\u00e7in Kesin Optimizasyon \u00c7\u00f6z\u00fcmleri<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>TBT skorunuzu 200 milisaniyenin alt\u0131na indirmek, kullan\u0131c\u0131lara p\u00fcr\u00fczs\u00fcz ve &#8220;ya\u011f gibi akan&#8221; bir deneyim sunmak i\u00e7in uygulaman\u0131z gereken teknik ad\u0131mlar \u015funlard\u0131r:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_JavaScript_Dosyalarini_Erteleyin_Defer_ve_Asenkronize_Edin_Async\"><\/span>1. JavaScript Dosyalar\u0131n\u0131 Erteleyin (Defer) ve Asenkronize Edin (Async)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Ana i\u015f par\u00e7ac\u0131\u011f\u0131 HTML kodlar\u0131n\u0131 yukar\u0131dan a\u015fa\u011f\u0131ya do\u011fru okur. Okurken <code>&lt;script&gt;<\/code> etiketine denk geldi\u011finde, o an HTML okumay\u0131 b\u0131rak\u0131r, o scripti indirir ve \u00e7al\u0131\u015ft\u0131rana kadar bekler. Bu durum TBT&#8217;yi f\u0131rlat\u0131r.<\/p>\n\n\n\n<p>Bu sorunu \u00e7\u00f6zmek i\u00e7in script etiketlerinize <code>defer<\/code> veya <code>async<\/code> niteliklerini eklemelisiniz.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>defer<\/code>:<\/strong> Taray\u0131c\u0131ya &#8220;HTML okumaya devam et, bu dosyay\u0131 arka planda indir ve sayfan\u0131n g\u00f6rsel \u00e7izimi bittikten sonra \u00e7al\u0131\u015ft\u0131r&#8221; emrini verir. Sitenin h\u0131zlanmas\u0131 i\u00e7in en g\u00fc\u00e7l\u00fc silaht\u0131r. WordPress kullan\u0131yorsan\u0131z &#8220;WP Rocket&#8221; veya &#8220;LiteSpeed Cache&#8221; gibi eklentilerden &#8220;Load JS Deferred&#8221; ayar\u0131n\u0131 a\u00e7arak bunu kod yazmadan yapabilirsiniz.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Dis_Kaynakli_Kodlari_Geciktirin_Delay_JS_Execution\"><\/span>2. D\u0131\u015f Kaynakl\u0131 Kodlar\u0131 Geciktirin (Delay JS Execution)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Berrin&#8217;in ya\u015fad\u0131\u011f\u0131 canl\u0131 destek ve analiz scriptleri sorununun en kesin \u00e7\u00f6z\u00fcm\u00fc, bu kodlar\u0131n y\u00fcklenmesini &#8220;Kullan\u0131c\u0131 Etkile\u015fimine&#8221; ba\u011flamakt\u0131r. &#8220;Delay JS Execution&#8221; tekni\u011fi sayesinde; kullan\u0131c\u0131 fareyi oynatana, ekrana dokunana veya sayfay\u0131 kayd\u0131rana kadar hi\u00e7bir reklam, canl\u0131 destek veya Analytics kodu y\u00fcklenmez. Sistem \u00f6nce sadece siteyi a\u00e7ar, ana i\u015f par\u00e7ac\u0131\u011f\u0131 tamamen bo\u015f kal\u0131r. Kullan\u0131c\u0131 sayfayla etkile\u015fime girdi\u011fi ilk milisaniye i\u00e7inde d\u0131\u015f kodlar arka planda tetiklenir. Bu teknik TBT skorunuzu mucizevi bir \u015fekilde s\u0131f\u0131ra yakla\u015ft\u0131r\u0131r.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Uzun_Gorevleri_Parcalara_Ayirin_Code_Splitting\"><\/span>3. Uzun G\u00f6revleri Par\u00e7alara Ay\u0131r\u0131n (Code Splitting)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>E\u011fer kendi yazd\u0131\u011f\u0131n\u0131z \u00f6zel bir yaz\u0131l\u0131m\u0131n\u0131z varsa, kod mimarisini g\u00f6zden ge\u00e7irmelisiniz. Yaz\u0131l\u0131m m\u00fchendisi <strong>Cengizhan<\/strong>, uygulamas\u0131nda 250 ms s\u00fcren devasa bir veri i\u015fleme fonksiyonu yazm\u0131\u015ft\u0131r. Taray\u0131c\u0131 250 ms boyunca kilitlenmektedir. Cengizhan bu fonksiyonu inceleyerek onu 50&#8217;\u015fer ms s\u00fcren 5 k\u00fc\u00e7\u00fck par\u00e7aya b\u00f6ler (\u00d6rne\u011fin <code>setTimeout<\/code> veya modern JavaScript k\u00fct\u00fcphanelerinde kod b\u00f6lme teknikleri kullanarak). Taray\u0131c\u0131 her 50 ms&#8217;lik par\u00e7an\u0131n aras\u0131nda nefes al\u0131r; e\u011fer o s\u0131rada kullan\u0131c\u0131 bir butona t\u0131klam\u0131\u015fsa, taray\u0131c\u0131 hemen ona yan\u0131t verir ve sonra veri i\u015flemeye kald\u0131\u011f\u0131 yerden devam eder.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Web_Workers_Teknolojisini_Kullanin\"><\/span>4. Web Workers Teknolojisini Kullan\u0131n<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Ana i\u015f par\u00e7ac\u0131\u011f\u0131 sadece bir tanedir, ancak modern taray\u0131c\u0131larda i\u015fleri devredilebilecek <strong>Web Workers<\/strong> ad\u0131 verilen g\u00f6r\u00fcnmez asistanlar bulunur. Veri bilimci <strong>Dilara<\/strong>, web sitesinde anl\u0131k olarak \u00e7al\u0131\u015fan a\u011f\u0131r bir kripto para algoritmas\u0131 hesaplatmaktad\u0131r. Dilara bu hesaplama kodlar\u0131n\u0131 ana i\u015f par\u00e7ac\u0131\u011f\u0131ndan \u00e7\u0131kar\u0131p bir &#8220;Web Worker&#8221; dosyas\u0131na yollar. Web Worker bu a\u011f\u0131r hesaplamay\u0131 arka planda, taray\u0131c\u0131n\u0131n performans\u0131n\u0131 hi\u00e7 etkilemeden yapar ve sonu\u00e7 bitti\u011finde ana ekrana iletir. Ana yol bo\u015f kald\u0131\u011f\u0131 i\u00e7in TBT hi\u00e7 etkilenmez. (2026&#8217;n\u0131n pop\u00fcler ara\u00e7lar\u0131ndan olan <em>Partytown<\/em>, Google Analytics gibi d\u0131\u015f scriptleri Web Workers i\u00e7ine ta\u015f\u0131yarak TBT sorunlar\u0131n\u0131 k\u00f6k\u00fcnden \u00e7\u00f6zen muazzam bir k\u00fct\u00fcphanedir).<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Gereksiz_Eklentileri_ve_Siskinligi_Bloat_Temizleyin\"><\/span>5. Gereksiz Eklentileri ve \u015ei\u015fkinli\u011fi (Bloat) Temizleyin<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>WordPress kullan\u0131yorsan\u0131z sitenizdeki her eklentiyi sorgulay\u0131n. Sadece bir ileti\u015fim formu g\u00f6stermek i\u00e7in sayfaya y\u00fczlerce sat\u0131rl\u0131k CSS ve JS dosyas\u0131 y\u00fckleyen eski nesil eklentileri kald\u0131r\u0131n. Bunlar\u0131n yerine hafif, mod\u00fcler ve sadece ihtiya\u00e7 duyulan sayfalarda kod y\u00fckleyen modern alternatiflere ge\u00e7i\u015f yap\u0131n. DOM boyutunuzu k\u00fc\u00e7\u00fcltmek i\u00e7in gereksiz yere i\u00e7 i\u00e7e ge\u00e7mi\u015f sat\u0131r ve s\u00fctun tasar\u0131mlar\u0131ndan ka\u00e7\u0131n\u0131n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sonuc_Etkilesim_Dijital_Sadakatin_Temelidir\"><\/span>Sonu\u00e7: Etkile\u015fim, Dijital Sadakatin Temelidir<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Web performans optimizasyonu, 2026 y\u0131l\u0131 itibar\u0131yla yaln\u0131zca arama motorlar\u0131n\u0131 (Google) memnun etmek i\u00e7in yap\u0131lan mekanik bir s\u00fcre\u00e7 olmaktan \u00e7\u0131km\u0131\u015f, do\u011frudan insan psikolojisiyle ilgili bir deneyim m\u00fchendisli\u011fine d\u00f6n\u00fc\u015fm\u00fc\u015ft\u00fcr.<\/p>\n\n\n\n<p><strong>Total Blocking Time (TBT)<\/strong>, kullan\u0131c\u0131n\u0131n dijital d\u00fcnyadaki sab\u0131r s\u0131n\u0131rlar\u0131n\u0131 \u00f6l\u00e7en en kritik laboratuvar metri\u011fidir. G\u00f6ze \u00e7ok h\u0131zl\u0131 y\u00fcklenmi\u015f gibi g\u00f6r\u00fcnen ancak t\u0131klamalara sa\u011f\u0131r bir duvar gibi duran web sayfalar\u0131; kullan\u0131c\u0131da sadece hayal k\u0131r\u0131kl\u0131\u011f\u0131 ve markaya kar\u015f\u0131 g\u00fcvensizlik yarat\u0131r.<\/p>\n\n\n\n<p>Ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131z\u0131 rehin alan o devasa JavaScript y\u00fcklerini erteledi\u011finizde, d\u0131\u015f kaynakl\u0131 takip scriptlerini etkile\u015fime ba\u011flay\u0131p geciktirdi\u011finizde ve uzun g\u00f6revleri k\u00fc\u00e7\u00fck, y\u00f6netilebilir lokmalara b\u00f6ld\u00fc\u011f\u00fcn\u00fczde; taray\u0131c\u0131n\u0131z\u0131n derin bir nefes ald\u0131\u011f\u0131n\u0131 g\u00f6receksiniz. TBT skoru s\u0131f\u0131ra yakla\u015fan, dokundu\u011funuz an milisaniyeler i\u00e7inde tepki veren bir web sitesi; yaln\u0131zca organik s\u0131ralamalar\u0131n\u0131z\u0131 (SEO) zirveye ta\u015f\u0131makla kalmayacak, ayn\u0131 zamanda d\u00f6n\u00fc\u015f\u00fcm oranlar\u0131n\u0131z\u0131 (sat\u0131\u015f, kay\u0131t, etkile\u015fim) hi\u00e7 beklemedi\u011finiz \u00f6l\u00e7\u00fcde art\u0131racakt\u0131r. Dijital d\u00fcnyada ba\u015far\u0131, h\u0131zla g\u00f6r\u00fcnmekle de\u011fil, h\u0131zla yan\u0131t verebilmekle ba\u015flar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Giri\u015f: T\u0131kl\u0131yorum Ama \u00c7al\u0131\u015fm\u0131yor Sendromu \u0130nternette gezinirken hepimizin ba\u015f\u0131na gelmi\u015f<a href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/\">&#8230;<\/a><\/p>\n","protected":false},"author":6,"featured_media":23821,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-23820","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cenuta.com\/blog\/tbt-total-blocking-time-nedir-sayfa-hizini-ve-tbt-skorunu-iyilestirme-rehberi-2026\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TBT (Total Blocking Time) Nedir? 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