INP (Interaction to Next Paint)

The Core Web Vital for interactivity, which replaced First Input Delay (FID) in March 2024. It measures how quickly the page visually responds across all your interactions (clicks, taps, key presses), not just the first. Target: under 200 ms. Poor INP is usually caused by heavy JavaScript blocking the main thread.

First used in: 2.4 · Technical SEO II — rendering, speed & mobile