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Luke Harsel

content writer AT SEMrushContent team member writing about SEO and Semrush's SEO toolkit.
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What Is CLS and Why Is It Important

What Is CLS and Why Is It Important?

Cumulative Layout Shift measures the total amount of layout shifts that occur on a web page as it loads and is interacted with. Google measures CLS in order to judge the overall page experience alongside the other two core web vitals, First Input Delay (FID) and Largest Contentful Paint (LCP).
Aug 19, 2021
First Input Delay (FID) and Total Blocking Time (TBT) Explained