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SEO

What is 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.

Detailed definition

The most important Core Web Vitals metric. It measures when the largest content element visible on screen (usually the hero image, video poster or h1) has fully loaded. To improve LCP: compress images (WebP/AVIF), use preload, use a CDN, reduce server response time, inline critical CSS and use lazy loading.

Examples

  • By using a 200KB WebP in the hero instead of a 2MB JPEG, you can bring LCP down from 4s to 2s.

Related terms

Core Web Vitals The three main metrics Google uses to measure site performance: LCP, INP and CLS. 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.
From the same category

Other terms in the SEO category

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. hreflang The link attribute that states which language sits at which URL on multilingual or multi-region sites.
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