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.
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CLS
Cumulative Layout Shift (CLS) quantifies how often users experience unexpected layout shifts. A fast CLS indicates that the page is delightful.
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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.