A metric measuring how quickly a page visually responds to user interactions.
ID
SS-DF-035
Confidence
High · 85
Evidence
Established
Updated
2026-07-08
Definition
A metric measuring how quickly a page visually responds to user interactions.
Interaction to Next Paint (INP) measures the latency between a user interaction, such as a tap or click, and the next visual update the browser paints, reporting the worst-case responsiveness across a visit. It replaced First Input Delay as a Core Web Vital in 2024 because it captures ongoing interactivity rather than only the first input. A good INP is 200 milliseconds or less, and heavy JavaScript execution on the main thread is the usual cause of poor scores.