Google introduced Core Web Vitals to standardize how page experience gets measured, moving beyond vague notions of "feels fast" into three concrete, measurable metrics.
LCP (Largest Contentful Paint) — how quickly the main content becomes visible. INP (Interaction to Next Paint) — how quickly the page responds to user input. CLS (Cumulative Layout Shift) — how much visual elements unexpectedly shift while loading.
Core Web Vitals thresholds are based on real user data collected across the web, not arbitrary targets — Google calibrated them against what actually correlates with a genuinely good experience.
Google defines specific thresholds for each metric — generally, LCP under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1 are considered good, based on real user data.
Google Search Console's Core Web Vitals report and PageSpeed Insights both show these metrics for real pages, based on actual visitor data where available.
NOXEL SEO's scan engine checks all three Core Web Vitals automatically, with specific, prioritized fix suggestions.
Yes, Google has confirmed they're part of the broader page experience ranking signals, though content relevance remains more heavily weighted overall.
Largest Contentful Paint — measuring how quickly the largest, main piece of content becomes visible to a visitor.
INP (Interaction to Next Paint) replaced FID in 2024, providing a more comprehensive measure of page responsiveness.
Elements like images or ads loading without reserved space, causing surrounding content to unexpectedly shift position as the page loads.
Yes, often significantly — Google reports and evaluates these metrics separately for mobile and desktop experiences.
Not strictly required, but meeting all three thresholds is associated with a better overall page experience signal.
Occasionally — as seen with the FID-to-INP transition, Google periodically refines these metrics based on evolving web standards and data.
See all three Core Web Vitals checked automatically with prioritized fixes.
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