<p>First Input Delay (FID) measures how soon your site becomes responsive to user input. Specifically, if a user clicks on a button or a link, how quickly does your site respond with the expected result of that action? </p> <p>FID is a good indicator of your reader’s first impression of your site’s interactivity and responsiveness. A good FID score means a reader is more likely to stick around on your site and return to consume more content. Everyone loves a fast, responsive site