What is the "Poor Cumulative Layout Shift" check?

P1 · HighPerformance

Poor Cumulative Layout Shift

CLS exceeds 0.25

Code: poor_cls

CLS exceeds 0.25. Slow experiences increase bounce rates and hurt Core Web Vitals scores. Google uses these metrics as a direct ranking signal.

FCP exceeds 3 seconds

FCP between 1.8-3 seconds

LCP exceeds 4 seconds

LCP between 2.5-4 seconds

CLS between 0.1-0.25

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