Technical Definition
INP (Interaction to Next Paint) replaced FID as a Core Web Vital in March 2024. It measures responsiveness by tracking the latency of all click, tap, and keyboard interactions throughout the page lifecycle. Good INP is under 200ms. Unlike FID which only measured first interaction, INP considers all interactions and reports the worst (with outliers excluded).
Simple Explanation (ELI13)
INP measures how quickly your website responds when people click buttons or type. If you click something and nothing happens for a while, that's bad INP. Google wants your site to respond in under 200 milliseconds. Heavy JavaScript that blocks the browser is usually the culprit when INP is slow.
Related Terms
Core Web Vitals, JavaScript, Page Experience, FID
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