CLS finder
Which elements move while the page loads, how much each adds to CLS and the likely cause.
One Lighthouse run with PageSpeed's default throttling; result kept for 1 hour. Want this on every page, every day, with an alert when it gets worse? Run the free site check · See plans
Related guides
How to fix CLS: what makes the page jump
What counts in CLS, the common causes (images, ads, fonts, animations) and how to reserve space in HTML and CSS. How to find the element that moves.
Core Web Vitals: what LCP, INP and CLS are and how to improve them
What LCP, INP and CLS measure, the good and poor thresholds, how Google uses these metrics in Search and where to find your site's data.
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