Don't have an account? Sign up
If you're already signed up, please sign in
CLS — Cumulative Layout Shift, a score of unexpected visible layout movement that occurs during the lifetime of a page.
The metric represents one part of user experience, such as main-content loading, responsiveness, layout stability, or server latency. Improving one metric does not compensate for serious problems in the others.
CLS — Cumulative Layout Shift, a score of unexpected visible layout movement that occurs during the lifetime of a page.
The value is captured in a browser or lab test at a defined point in loading or interaction. Real-user field data and lab measurements can differ because of devices and networks.
First identify the resource, script, request, or layout change causing the delay. Optimize the server, critical resources, images, and JavaScript, then reassess field data.
