Largest Contentful Paint (LCP) marks the time when the page's main content has likely loaded. A fast LCP helps reassure the user that the page is useful.
i
FID
First Input Delay (FID) quantifies the experience users feel when trying to interact with unresponsive pages. A fast FID indicates that the page is usable.
i
CLS
First Contentful Paint (FCP) marks the time when the user can see anything on the screen. A fast FCP helps reassure the user that something is happening.