Interaction to Next Paint (INP)

Interaction to Next Paint (INP) is Google’s newest Core Web Vitals metric, replacing First Input Delay (FID). INP measures the overall responsiveness of a webpage by tracking the latency of all click, tap, and keyboard interactions throughout the entire lifespan of a user’s visit, not just the first interaction. A poor INP score (over 500 milliseconds) indicates that the main thread is blocked by heavy JavaScript execution, causing the page to freeze or lag when the user tries to engage. Passing INP requires ruthless optimization of third-party scripts, breaking up long tasks, and minimizing DOM size.

Interaction to Next Paint (INP) Simplified

INP is Google’s measurement of how quickly your website reacts when someone clicks a button or types in a form. If your website is bogged down by heavy code and takes a full second to respond to a click, Google will lower your rankings for providing a frustrating experience.