Measure First Input Delay (FID) and analyze how quickly your website responds to user interactions. Part of Core Web Vitals and essential for performance optimization.
FID measures the time between a user's first interaction (click, tap, or key press) and when the browser responds to that interaction.
A low FID means your website is responsive and provides a better user experience.
FID has been replaced by INP (Interaction to Next Paint) as part of Core Web Vitals. INP provides a more complete measure of responsiveness across all interactions.
However, FID is still useful for understanding input delay and optimizing performance.
It measures the delay between user interaction and browser response.
It has been replaced by INP but is still useful for analysis.
Optimize JavaScript and reduce blocking tasks.