Interaction to Next Paint
A Core Web Vital measuring overall responsiveness as the latency of the worst (approximately) interaction on a page; good is 200 ms or…
TechnicalFID
First Input Delay
The retired responsiveness Core Web Vital measuring only the delay before the browser began processing a page's first interaction; replaced by INP in March 2024.
In full
FID captured input delay but not the time to run the handler or paint the result, so pages could score well while feeling unresponsive. Google announced its deprecation in 2023 and removed it from Core Web Vitals in March 2024, retaining it briefly in tooling before removal. It is included here because historical reports, dashboards and older articles still reference it; current work should target INP.
Example
A dashboard built in 2022 still charts FID; the data stops in 2024 and must be rebuilt against INP.
Related terms
Core Web Vitals
Google's set of three field-measured user experience metrics — LCP, INP and CLS — used as part of the page experience signals in ranking.
Chrome User Experience Report
Google's public dataset of real-user performance measurements from opted-in Chrome users, and the official source of Core Web Vitals…
Lighthouse
An open-source automated auditing tool in Chrome DevTools and PageSpeed Insights that runs lab tests for performance, accessibility, best…
Page experience
Google's umbrella term for signals about how users perceive interacting with a page, including Core Web Vitals, HTTPS and absence of…
Where to read more
- Interaction to Next Paint (INP) · Documentation · web.dev