Technical SEO Wiki Entry

Cumulative Layout Shift (CLS)

A Core Web Vital measuring unexpected visual movement during page load.

CLS quantifies how much page content shifts unexpectedly during loading. Good CLS is below 0.1, needs improvement is 0.1-0.25, poor is over 0.25. CLS is caused by images without dimensions, dynamically injected ads, fonts loading after layout, embeds without reserved space and animations affecting non-transform properties. Reserving space for ads and media usually solves CLS.

Related Entries

Core Web Vitals

Google's page experience metrics measuring loading, interactivity and stability.

Web Vitals

Google's broader set of performance metrics, including but extending beyond Core Web Vitals.

Lighthouse

Google's open-source automated tool for auditing site performance, accessibility and SEO.

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