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Core Web Vitals
The short answer
Core Web Vitals are Google's three official measurements of real-world page experience: how fast the main content loads, how quickly the page responds to input, and how much it visually shifts around while loading.
Full explanation
The three metrics are Largest Contentful Paint (loading speed), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability). Google uses these as a ranking signal, and a slow, jumpy page also frustrates both human visitors and the crawlers trying to read it within a limited time budget.
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