Technical SEO

What is INP (Interaction to Next Paint)?

INP is the time between a user interaction (click, tap) and the visible screen response — target: < 200ms. Replaced FID in 2024.

INP (Interaction to Next Paint) measures responsiveness. It replaces the old FID, which only looked at the 1st interaction; INP measures the WORST interaction of the session — more realistic.

Villain #1: heavy JavaScript on the main thread. Fix: code-splitting, web workers for computation, scroll/resize throttling, and avoiding unnecessary React re-renders (memo, virtualization).

Formula

Bom: ≤ 200ms · Pode melhorar: 200–500ms · Ruim: > 500ms

Use it in practice

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Related terms

Frequently asked questions

How to measure INP in production?

Web Vitals JS lib + your own analytics, or Google Analytics 4 (already reports INP). PageSpeed shows real field data via CrUX.

Will React sites always have bad INP?

No. Well-optimized SPAs (React Server Components, suspense, code-splitting) hit INP < 200ms comfortably.