1.5 Performance & Core Web VitalsMediumVerified

INP > 200ms

Interaction to Next Paint measures how quickly the page responds when someone taps or clicks. Above 200ms it feels sluggish, and the cause is usually heavy JavaScript blocking the main thread.

What it is

Interaction to Next Paint above ‘good’.

Why it matters

Sluggish interactivity harms UX.

How to fix it

Reduce long tasks; optimise event handlers.

How to find it on your site

  1. Read INP from PageSpeed Insights field data and the Search Console Core Web Vitals report.
  2. Reproduce slow interactions and profile the main thread in DevTools Performance.
  3. Break up long JavaScript tasks and defer non-essential work.
  4. Re-measure INP after reducing main-thread blocking.

Cross-reference to ranking and citation factors

INP replaced FID as a Core Web Vital. Responsiveness is both a ranking input and a major driver of how usable the page feels.

Impact

Low-medium. Direct.

Evidence

INP ‘good’ < 200ms (replaced FID in 2024). web.dev, Core Web Vitals (Google); Google Search Central, Understanding page experience in Google Search results

← CLS > 0.1Excessive TTFB →