Matan · SEO · Performance

INP (lab)

Interaction to Next Paint should stay under 200ms so clicks feel instant.

Pass condition in our engine: Lab INP is under 200ms when PageSpeed Insights is available.

1. Problem description

INP replaced FID. Long tasks from third-party tags, huge React hydration and un-debounced handlers make the UI feel broken even when LCP looks fine. Lab INP is an approximation (sometimes TBT is used as a fallback).

2. Most common causes

  • Heavy third-party scripts on every page.
  • Main-thread work during hydration.
  • Synchronous click handlers that do too much.

3. How to fix it

  1. Defer non-essential JS; split bundles.
  2. Break up long tasks (scheduler.yield / setTimeout).
  3. Profile with Performance panel on a throttled CPU.

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