Largest Contentful Paint (LCP)Core Web Vital 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)Core Web Vital 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)Core Web Vital quantifies the experience users feel when trying to interact with unresponsive pages. A fast FID indicates that the page is usable.