// Performance
A Core Web Vital that measures how much visible content unexpectedly moves during page load. A CLS score above 0.1 means elements are jumping around — often caused by images without dimensions or late-loading ads.
Why it matters: CLS (Cumulative Layout Shift) is one of the performance signals that shapes how search engines, AI tools, and real visitors experience your website. Getting it right removes friction, protects your rankings, and makes every other optimization work harder. Auditing it regularly is the fastest way to catch regressions before they cost you traffic or conversions.
See how your own site handles cls (cumulative layout shift) — no signup required.
Check your site's CLS (Cumulative Layout Shift) — run the free Performance Agent