---
type: Glossary Term
title: "Interaction to Next Paint (INP)"
description: "Worst-case latency between a user input and the next visual update."
resource: "https://prerendering.com/glossary/inp"
tags: [metrics, glossary]
timestamp: 2026-05-11T00:00:00Z
---

# Interaction to Next Paint (INP)

Worst-case latency between a user input and the next visual update.

A Core Web Vital that replaced First Input Delay in March 2024. Measures the longest interaction (click, tap, key) latency through the session. Good < 200ms, needs improvement 200-500ms, poor > 500ms. Heavy JS event handlers, large React re-renders, and main-thread work hurt INP.

Also known as: INP.

## Related

- [Core Web Vitals Optimization for Engineering Teams](/blog/core-web-vitals-for-engineering-teams.md)