SEO
INP (Interaction to Next Paint)
Quick definition
INP is a Core Web Vitals metric measuring how quickly a page responds to user interactions, replacing First Input Delay (FID) in 2024.
INP target: under 200ms for 'Good'. It captures the latency of all interactions, not just the first — a tougher metric than the FID it replaced.
Why INP (Interaction to Next Paint) matters
High INP usually points to heavy JavaScript execution blocking the main thread — frameworks, hydration, and third-party scripts are common culprits.
How INP (Interaction to Next Paint) works in practice
Improve INP by breaking up long tasks, code-splitting, deferring non-critical JavaScript, and auditing third-party scripts (analytics, tag managers, chat widgets).