PERFORMANCE · SEO GLOSSARY
LCP (Largest Contentful Paint)
The time from page load start until the largest visible content element finishes rendering. Should be under 2.5 seconds.
Definition
Largest Contentful Paint (LCP) measures the render time of the largest image, video, or text block visible in the viewport when the page loads. Google considers LCP "good" at under 2.5 seconds, "needs improvement" between 2.5s and 4.0s, and "poor" above 4.0 seconds.
Why it matters for SEO
LCP is the Core Web Vital most closely tied to perceived load speed. When the biggest visible element — usually a hero image, banner, or above-the-fold text block — loads slowly, users experience the page as slow even if other elements are fast. A 1-second delay in LCP can reduce conversions by 7–15% in e-commerce studies. It is a direct Google ranking signal as part of the Core Web Vitals page-experience update.
How DeepSEOAnalysis checks this
The audit checks LCP from both CrUX field data (real Chrome users) and PageSpeed Insights lab data. Field data is used as the primary signal since it reflects actual user conditions. LCP over 2.5s from field data is flagged as critical. Common causes the audit helps diagnose: render-blocking resources, unoptimized hero images, and slow server response times (TTFB).
Useful tools and resources
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