Optimize your page for interaction readiness.In other words, theīrowser can't respond to user interactions while the main thread is busy. The browser cannot respond to most user input while it's executing JavaScript on the main thread. Optimizing how JavaScript parses,Ĭompiles, and executes on your web page will directly reduce FID. The main cause of a poor FID is heavy JavaScript execution. Improvements in TBT usually correspond to improvements in FID. A real user interaction is required in order to measure the It measures the time from when a userįirst interacts with a page to the time when the browser is actually able to respond to that Responsiveness: or how quickly a page responds to user interaction.įirst Input Delay (FID) is a Core Web Vitals metric that captures a user'sįirst impression of a site's interactivity and responsiveness. Although important, paint times do not capture load Paint (LCP) are both metrics that measure the time it takes for content to I clicked but nothing happened! Why can't I interact with this page? □įirst Contentful Paint (FCP) and Largest Contentful Twitter GitHub Glitch Homepage Key point: FID will be replaced by Interaction to Next Paint (INP) as a Core Web Vital in March 2024.
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