Largest Contentful Paint
Also called: LCP
Largest Contentful Paint (LCP) is a Core Web Vitals metric that measures how long it takes for the largest image, text block, or video in the viewport to render, timed from when the user first navigates to the page. Google treats 2.5 seconds or less, at the 75th percentile, as a good score.
LCP looks at a single element: the biggest piece of content painted in the visible viewport during load. That is usually a hero image, a background image set with url(), a video poster frame, or a large block of text. Chrome watches the render sequence and reports the timestamp of whichever qualifying element ends up largest once the page settles.
What “good” means
Google grades LCP on real-user (field) data at the 75th percentile, split across mobile and desktop:
- Good: 2.5 s or less
- Needs improvement: 2.5 s to 4.0 s
- Poor: over 4.0 s
It helps to split LCP into four parts: Time to First Byte, resource load delay, resource load duration, and element render delay. In an ideal budget, TTFB and the resource download each take roughly 40 percent, leaving the two delay phases under 10 percent each. That breakdown tells you where the time actually goes. A slow server points at TTFB. A hero image the browser discovers late (because JavaScript injects it) points at load delay.
Common fixes are mechanical, not editorial: mark the LCP image fetchpriority="high", never lazy-load it, keep it in the initial HTML so the browser finds it early, serve WebP or AVIF through a CDN, and cut render-blocking CSS and JavaScript. Lab tools like Lighthouse estimate LCP, but the grade Google uses comes from field data, so validate against Chrome User Experience Report or Search Console, not just a single lab run.
How it affects your traffic
LCP is one of the three Core Web Vitals (with INP and CLS) that Google says align with what its core ranking systems reward, so a slow largest paint can hold back pages that are otherwise well optimized, and it costs conversions because visitors bounce before the hero even appears. Because the score runs on field data at the 75th percentile, your worst-served visitors (mobile, slower networks) set the grade, not your fastest ones. Fixing LCP is server, asset, and render work rather than copy edits, which is exactly what our Technical SEO service handles: we audit the four-part LCP breakdown and clear the render-blocking and image-delivery issues that keep pages stuck in the "needs improvement" or "poor" band.
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