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SEO glossary

Core Web Vitals

Google’s user-centric performance metrics: LCP (loading), INP (interactivity), and CLS (visual stability) that influence page experience signals.

Definition

Core Web Vitals are metrics that capture real-user loading, interactivity, and visual stability. As of 2024+, they include Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). They matter because slow or unstable experiences reduce engagement and can dampen visibility where page experience is evaluated. For SEO, CWV shape technical priorities—image optimization, script strategy, and layout discipline—so content is quickly usable. They influence template design, media handling, and monitoring practices and are best tracked with field data to reflect real users, not just lab scores.

What matters
  • Focus on LCP, INP, CLS with field data
  • Optimize images, scripts, and layout stability
How it plays out
  1. Context

    A SaaS blog’s LCP is 4.5s on mobile.

  2. Action

    The team compresses hero images, preloads critical assets, and defers non-essential JS.

  3. Result

    LCP drops below 2.5s, session depth improves, and rankings stabilize on competitive head terms.

Beyond definitions

Knowing the term is not the same as ranking for it

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