What is Total Blocking Time?
Total Blocking Time is a performance or UX concept that affects page quality, usability, and search experience.
Total Blocking Time is part of the performance & ux layer of SEO. It helps search engines or users interpret a page, a website structure, or a performance signal more clearly. In practice, teams review total blocking time during audits, content planning, migrations, or ongoing optimization work.
SEO Impact
Improving this usually leads to a faster, smoother, and more user-friendly page experience.
Example
Total Blocking Time appears in many SEO audits, reports, and optimization workflows.
Related Terms
What are Core Web Vitals?
Core Web Vitals are 3 Google metrics measuring the speed, responsiveness, and visual stability of a web page.
What is CLS (Cumulative Layout Shift)?
CLS measures a page's visual stability. A poor CLS means elements move around during loading.
What is LCP (Largest Contentful Paint)?
LCP measures the loading time of the largest visible element on a page. Target: under 2.5 seconds.
What is Page Loading Speed?
Loading speed measures the time needed to fully display a web page. It's a Google ranking factor.
What is Lazy Loading?
Lazy loading is a technique that delays loading images and videos until they're visible on screen.
What is Google Lighthouse?
Lighthouse is a Google tool that audits a web page's performance, accessibility, SEO, and best practices.