Glossary
Core Web Vitals
Google's standardised performance metrics: LCP (loading), INP (interactivity) and CLS (visual stability).
Definition
Core Web Vitals are the three real-user performance metrics Google uses as a page-experience ranking signal: Largest Contentful Paint (how long until the main content paints), Interaction to Next Paint (how responsive the page feels to user input), and Cumulative Layout Shift (how stable the layout is during load). Each metric has 'good', 'needs improvement' and 'poor' thresholds.
Why it matters
Core Web Vitals directly affect search ranking and conversion. Most agencies miss them because they only test on desktop with cached assets. Real users on real mobile networks see different numbers — and Google ranks based on those.
See also
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