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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 and height increase CLS.
  • Lazy loading images further down the page lightens the initial load; the LCP image itself should not be lazy loaded.

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 A shared vocabulary for marking up information on web pages (products, prices, organisations, articles) in fields machines can read; used for Google rich result eligibility, with no ranking guarantee. On-Page SEO The SEO optimisation carried out on the page itself: title, meta description, heading hierarchy and content quality.
Category SEO

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From the same category

Other terms in the SEO category

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. hreflang The link attribute that states which language sits at which URL on multilingual or multi-region sites. Meta Description The short description that can appear under the title in Google search results. It is not a ranking factor but influences whether people click. SERP (Search Engine Results Page) The search engine results page — the mix of organic results, ads and rich snippets the user sees after searching. E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) The framework Google uses in quality assessment: experience, expertise, authoritativeness and trust. It is not a direct ranking factor.
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