The INP metric assesses a page’s overall responsiveness to user interactions by observing the latency of all click, tap, and keyboard interactions that occur throughout the lifespan of a user’s visit to a page. The final INP value is the longest interaction observed, ignoring outliers.
The goal of INP is to ensure the time from when a user initiates an interaction until the next frame is painted is as short as possible, for all or most interactions the user makes. A low INP means that a page is reliably responsive to user input.
It differs from the First Input Delay (FID) in that INP measures all interactions throughout the page’s lifecycle, while FID only considers the first interaction. Therefore, INP can be seen as a more comprehensive measure of a website’s overall responsiveness.
- A good INP score is below or at 200 milliseconds, signifying good responsiveness.
- An INP score above 200 milliseconds but below or at 500 milliseconds indicates a need for improvement
- An INP score above 500 milliseconds is considered poor.
Google has announced that INP will be replacing FID as part of its Core Web Vitals.
Related Martech Zone Content
