Interaction to Next Paint (INP)
A Core Web Vital that measures page responsiveness by tracking the latency of user interactions.
Quick Definition
A Core Web Vital that measures page responsiveness by tracking the latency of user interactions.
Full Explanation
Interaction to Next Paint (INP) is one of Google's three Core Web Vitals, replacing First Input Delay (FID) in March 2024. INP measures the latency of all user interactions (clicks, taps, keyboard inputs) throughout a page's lifecycle, reporting a value that approximates the worst interaction. Unlike FID which only measured input delay, INP captures the full interaction: input delay + processing time + presentation delay. A good INP score is under 200 milliseconds. Common causes of poor INP include long JavaScript tasks, heavy event handlers, third-party scripts, and excessive DOM size. To improve INP, break long tasks, defer non-critical JavaScript, and use React's concurrent features.
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Related Terms
Largest Contentful Paint
A Core Web Vital that measures how long it takes for the largest content element to become visible.
Cumulative Layout Shift
A Core Web Vital that measures visual stability by quantifying unexpected layout shifts.
First Input Delay
A deprecated Core Web Vital that measured the delay before the browser could respond to the first user interaction.
Total Blocking Time
A lab metric measuring the total time the main thread was blocked long enough to prevent input responsiveness.
Core Web Vitals
A set of three metrics (LCP, INP, CLS) that Google uses to measure user experience and as ranking factors.