Google Chrome has officially ended support for the First Input Delay (FID) metric, marking a transition to prioritizing Interaction to Next Paint (INP).
The announcement by Rick Viscomi, who oversees web performance developer relations for the Chrome team, confirms INP as the core metric for evaluating interaction responsiveness.
Today’s the day: Chrome ends support for FID
If you’re still relying on it in Chrome tools, your workflows WILL BREAK
We’re all-in on INP!https://t.co/sc6utE44MN
— Rick Viscomi (@rick_viscomi) September 10, 2024
Today’s announcement follows the replacement of FID with INP as a Core Web Vital in May.
The following tools will stop reporting FID data over the next few days:
PageSpeed Insights
Chrome User Experience Report (CrUX)
web-vitals.js
Web Vitals extension
Background
The move to replace FID with INP stems from limitations in capturing the full scope of interaction responsiveness on the web.
FID only measured the delay between a user’s input and the browser’s response, overlooking other critical phases.
INP takes a more holistic approach by measuring the entire process, from user input to visual updates on the screen.