INP (Interaction to Next Paint)
Sitecheck Team
A responsiveness metric measuring how quickly a page responds to user input.
INP (Interaction to Next Paint) measures the responsiveness of a page by looking at how long it takes after a user interaction for the next paint to occur. It replaced FID as a Core Web Vitals metric.
Why it matters: Poor INP indicates sluggish interactions and directly impacts how responsive a site feels.
Quick tips:
- Reduce long tasks by splitting work and deferring non-critical scripts.
- Optimize JavaScript execution and avoid heavy main-thread work.
- Use passive event listeners where appropriate.
See also: Core Web Vitals, LCP, CLS.