What is the "Large third-party script" check?

P3 · LowPerformance

Large third-party script

Individual third-party script exceeds 100 KB

Code: third_party_large_payload

Why it matters

Individual third-party script exceeds 100 KB. Slow experiences increase bounce rates and hurt Core Web Vitals scores. Google uses these metrics as a direct ranking signal.

Related checks in Performance

Slow First Contentful Paint

FCP exceeds 3 seconds

FCP needs improvement

FCP between 1.8-3 seconds

Slow Largest Contentful Paint

LCP exceeds 4 seconds

LCP needs improvement

LCP between 2.5-4 seconds

Poor Cumulative Layout Shift

CLS exceeds 0.25

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