INP
Interaction to Next Paint: how quickly a page visibly responds after someone taps, clicks or types, measured across their whole visit.
Interaction to Next Paint, or INP, is one of Google’s three Core Web Vitals. It measures responsiveness: when someone taps a button, opens a menu or types in a form, how long until the page visibly reacts. INP looks at interactions across the whole visit and reports one of the slowest.
INP replaced an older measure, First Input Delay, as a Core Web Vital in 2024. According to web.dev’s INP guide, a good INP is 200 milliseconds or less.
Why it matters to a small business
A page that looks loaded but doesn’t respond to taps feels broken. Visitors tap again, give up, or assume your form doesn’t work. On lower-powered phones, the problem is worse.
The usual cause is too much JavaScript running in the browser. Common culprits:
- Many plugins each adding their own scripts.
- Chat widgets, sliders and pop-ups.
- Several tracking and marketing tags.
- Heavy page builders.
Example
A retail site’s mobile menu takes a noticeable moment to open after a tap. Testing shows three marketing scripts and a slider running on every page. Removing unused scripts and loading the rest later makes the menu respond almost instantly.
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