Interaction to Next Paint (INP)
A Core Web Vital measuring how quickly a page responds visually to user interactions.
Why It Matters
INP replaced FID as a Core Web Vital and provides a more complete picture of page responsiveness.
How It Works
INP observes all clicks, taps, and keyboard interactions throughout the page lifecycle and reports the worst interaction latency (with outliers excluded). Good INP is under 200 milliseconds.
Real-World Example
A checkout button takes 450ms to respond visually; optimizing the event handler reduces INP to 150ms.
Common Mistakes
Only optimizing the first interaction and ignoring subsequent ones
Running heavy computations on the main thread
Related Terms
A set of Google metrics measuring page loading speed, interactivity, and visual stability.
A metric measuring the delay between a user first interaction and the browser response.
A Core Web Vital measuring how much page content shifts unexpectedly during loading.
Interaction to Next Paint (INP) FAQs
How is INP different from FID?
FID only measures the first interaction; INP measures all interactions and reports the worst-case response time.
What is a good INP score?
Under 200 milliseconds is considered good by Google standards.
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