Performance · Website glossary

Interaction to Next Paint

Quick answer · What is Interaction to Next Paint?

INP assesses page responsiveness by examining the latency of qualifying interactions over a visit.

IN PRACTICE

Interaction to Next Paint: an example

A menu click waits while a long JavaScript task occupies the main thread, delaying the visible response.

KEEP IN MIND

A fast initial load does not ensure responsive interactions later in the visit.

Put the idea to work

Frequently asked questions

What is a practical example of Interaction to Next Paint?

A menu click waits while a long JavaScript task occupies the main thread, delaying the visible response.

Does a fast initial load guarantee responsive interactions?

A fast initial load does not ensure responsive interactions later in the visit.

Which concepts should I read alongside Interaction to Next Paint?

Core Web Vitals: A set of user-experience metrics covering loading, interaction responsiveness, and visual stability, currently LCP, INP, and CLS.
JavaScript: A programming language widely used to add behavior to web pages and run application logic in other environments.