Why it matters to a buyer
LCP is a reasonable stand-in for the moment a visitor actually feels a page has loaded, which matters more than the older, more technical "page load" events browsers used to report, because it tracks the specific large element a visitor is waiting to see. For a buyer, slow LCP is a direct conversion problem before it is a ranking one: visitors abandon a slow-loading page well before Google's own page experience signals are involved.
How it is measured or applied
LCP is usually slowed by a large hero image or video that loads late, render-blocking CSS or JavaScript, slow server response time, or serving the same unoptimised asset to every device regardless of screen size. Fixes include compressing and correctly sizing images, using a content delivery network to shorten the physical distance data travels, preloading the key hero asset, and removing render-blocking resources from the critical path. It is measured with real visitor data in PageSpeed Insights and Search Console's Core Web Vitals report, and diagnosed element by element in Chrome DevTools.
Sources
- Largest Contentful Paint (LCP), web.dev (Google)
