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SEO

What is Core Web Vitals?

The three main metrics Google uses to measure site performance: LCP, INP and CLS.

Detailed definition

Core Web Vitals are the three metrics Google takes into account in its SEO rankings as user experience signals: LCP (Largest Contentful Paint — how long the main content takes to load, target <2.5s), INP (Interaction to Next Paint — the first response after a user interaction, target <200ms) and CLS (Cumulative Layout Shift — unexpected layout shifts, target <0.1). They are measured with PageSpeed Insights. Mobile and desktop are assessed separately.

Examples

  • Images without a width/height attribute increase CLS.
  • Using lazy loading on a page improves LCP.

Related terms

LCP (Largest Contentful Paint) How long the page's main content block (usually the hero image or heading) takes to load. Good: <2.5s, poor: >4s. CLS (Cumulative Layout Shift) The total score for unexpected layout shifts while the page loads. Good: <0.1. SEO (Search Engine Optimization) The discipline of increasing a website's organic (unpaid) visibility on Google and other search engines. Schema.org / Structured Data The standard for adding machine-readable data to web pages. Critical for Google rich results and for AI engines. On-Page SEO The SEO optimisation carried out on the page itself: title, meta description, heading hierarchy and content quality.
From the same category

Other terms in the SEO category

LCP (Largest Contentful Paint) How long the page's main content block (usually the hero image or heading) takes to load. Good: <2.5s, poor: >4s. CLS (Cumulative Layout Shift) The total score for unexpected layout shifts while the page loads. Good: <0.1. Schema.org / Structured Data The standard for adding machine-readable data to web pages. Critical for Google rich results and for AI engines. On-Page SEO The SEO optimisation carried out on the page itself: title, meta description, heading hierarchy and content quality. Backlink A link given to your site from another site. One of the most important off-page signals in SEO. Canonical URL The <link rel="canonical"> tag that tells Google the "main" URL of a page.
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