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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TBT
Total Blocking Time (TBT) highlights interactivity of the page. It is a sum of all time periods between FCP and TTI, when task length exceeded 50ms.
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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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Perf
Performance Score (Perf) estimates the speed of your page based on metrics.
