What is the "Slow First Contentful Paint" check?

P1 · HighPerformance

Slow First Contentful Paint

FCP exceeds 3 seconds

Code: slow_fcp

FCP exceeds 3 seconds. Slow experiences increase bounce rates and hurt Core Web Vitals scores. Google uses these metrics as a direct ranking signal.

FCP between 1.8-3 seconds

LCP exceeds 4 seconds

LCP between 2.5-4 seconds

CLS exceeds 0.25

CLS between 0.1-0.25

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