First Input Delay (FID): The First Input Delay is a user-centric performance metric that measures the time it takes for a website to respond to a user's first interaction, such as clicking a button, tapping a link or filling out a form. A shorter FID indicates a more responsive user experience, which is essential for engaging and keeping visitors on your site. This metric helps you assess your site's interactivity and identify areas for improvement to provide a faster and smoother experience for your audience.
