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Marketing Glossary· CWV

What are Core Web Vitals?

By Nikhil Sharma · Updated 1 November 2026 · Marketing Glossary
Definition

Core Web Vitals (CWV) are a set of Google metrics that measure real-world page experience across three dimensions: loading speed, interactivity and visual stability.

The three Core Web Vitals

  • LCP (Largest Contentful Paint) — loading: how fast the main content appears (good < 2.5s).
  • INP (Interaction to Next Paint) — interactivity: how quickly the page responds to input (good < 200ms). INP replaced FID in 2024.
  • CLS (Cumulative Layout Shift) — stability: how much the layout jumps around (good < 0.1).

Why they matter for SEO

Core Web Vitals are part of Google’s page-experience signals and a ranking consideration. More importantly, they measure genuine user experience: slow, janky pages lose visitors and conversions, which hurts conversion regardless of rankings. See our speed optimization service.

How to improve them

Optimise images and fonts, reduce heavy JavaScript, reserve space for media to stop layout shift, and use good hosting and caching. Measure with Google’s PageSpeed Insights and Search Console’s Core Web Vitals report on real-user data.

Related terms
SEOCROSERPOrganic TrafficBounce Rate
NS
Written & reviewed by Nikhil Sharma
Founder, Fabulous Media
Nikhil has led growth for 850+ brands across 35 nations since 2008. Fabulous Media is an invitation-only growth agency that reports on pipeline and revenue, not vanity metrics. Meet the team · Request an invite.

Questions, answered

Largest Contentful Paint (LCP) for loading, Interaction to Next Paint (INP) for interactivity, and Cumulative Layout Shift (CLS) for visual stability. INP replaced First Input Delay in 2024.

Yes, they are part of Google's page-experience signals, though content relevance and authority matter more. Beyond ranking, they strongly affect user experience and conversion.

Optimise images and fonts, cut heavy JavaScript, reserve space for media to prevent layout shifts, and use fast hosting and caching. Measure with PageSpeed Insights and the Search Console report.

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