How do I improve my website's LCP value?

Q: How do I improve my website's LCP value?

LCP is the sum of four phases. First, the server response time (TTFB), reduced through optimized hosting, caching and, where appropriate, a CDN. Second, render-blocking resources such as non-critical CSS and synchronous JavaScript that delay the first paint. Third, the load time of the LCP resource itself, usually a large hero image. Fourth, the render time on the client, which can grow sharply in JavaScript-heavy frameworks without server-side rendering. In practice the biggest lever almost always lies in the first two phases. We reduce TTFB through server optimization, deliver the LCP image in modern WebP or AVIF format and prioritize it via preload so the browser fetches it immediately. Once render-blocking scripts are deferred and critical CSS is inlined, LCP often drops by more than half (project experience).

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Accepted Answer

LCP is the sum of four phases. First, the server response time (TTFB), reduced through optimized hosting, caching and, where appropriate, a CDN. Second, render-blocking resources such as non-critical CSS and synchronous JavaScript that delay the first paint. Third, the load time of the LCP resource itself, usually a large hero image. Fourth, the render time on the client, which can grow sharply in JavaScript-heavy frameworks without server-side rendering.

In practice the biggest lever almost always lies in the first two phases. We reduce TTFB through server optimization, deliver the LCP image in modern WebP or AVIF format and prioritize it via preload so the browser fetches it immediately. Once render-blocking scripts are deferred and critical CSS is inlined, LCP often drops by more than half (project experience).

How do I improve my website's LCP value?

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