Core Web Vitals Diagnostic Checklist

Field data Confirm the affected URL group in CrUX or Search Console. Separate mobile and desktop behavior.

LCP Identify and prioritize the real LCP resource. Check TTFB, image sizing, preload, and render blocking.

INP Profile long tasks and event handlers. Break work into smaller tasks and reduce main-thread JavaScript.

CLS Reserve dimensions for images, embeds, ads, and dynamic UI. Verify font and late-content shifts.

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