Glossary · INP (Interaction to Next Paint)
INP (Interaction to Next Paint)
A Core Web Vitals metric (replaced FID in 2024) measuring the time between user input and the next visual update.
INP measures responsiveness across all user interactions on a page, not just the first. Good INP is under 200ms; needs improvement is 200–500ms; poor is over 500ms.
Common INP fixes: reduce JavaScript execution time, break up long tasks, debounce or throttle expensive event handlers, defer non-critical work.