In brief: Interaction to Next Paint is a Core Web Vitals metric that evaluates overall page responsiveness to interactions through the latency of observed clicks, taps and key presses.
How I use INP or Interaction to Next Paint in practice
I do not use INP as another number for a presentation. First I define which decision it should improve, which data or observations support it and who will change something based on the result. I start with real field data and a problematic template, then use the browser to break down input delay, handler work and waiting for the next render. I record the baseline, measurement date and interpretation boundaries so a real shift can later be distinguished from a change in tool, sample or query wording.
What to watch
The greatest risk is precision that only looks real. A fast page load does not guarantee good INP; long tasks, extensive JavaScript and complex repainting appear during interaction. Compare results over time on a stable sample and with business context. If a term does not lead to a concrete next step, there is no analysis, only another label.
Questions for decisions
- Which interactions are actually slow?
- Is the problem input delay, a script or rendering?
- Does it concern a specific template or device?
- How will we verify the impact in field data?