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Medium impactPerformance

High Interaction to Next Paint (INP)

Slow response to clicks and taps fails INP. Here's how to find and fix the JavaScript that's blocking the main thread.

What it means

The page takes longer than 200ms to respond visually to user interactions like clicks and taps.

Why it matters

INP replaced FID as a Core Web Vitals metric in 2024 and tightened in 2026. Slow interactions feel broken even if the page looks fine.

How to fix it

  1. Audit third-party scripts in PageSpeed Insights.
  2. Defer or remove non-critical JS (analytics, chat widgets).
  3. Code-split bundles so each page only loads what it needs.
  4. Replace heavy libraries with smaller alternatives.
  5. Use requestIdleCallback for tracking and analytics.

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Frequently asked questions

What's the INP target?

Under 200ms. Under 100ms is excellent.

Related issues

Render-Blocking Resources
CSS and JS in the <head> block rendering. Here's how to defer or inline them safely.
Slow Largest Contentful Paint (LCP)
LCP over 2.5 seconds fails Core Web Vitals. Here's a step-by-step fix that actually moves the metric.