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optimization-strategies.md•2.1 KiB

# LCP Optimization Strategies ## 1. Eliminate Resource Load Delay **Goal**: Ensure the LCP resource starts loading as early as possible. - **Early Discovery**: Ensure the LCP resource is discoverable in the initial HTML document response (not dynamically added by JS or hidden in `data-src`). - **Preload**: Use `<link rel="preload">` with `fetchpriority="high"` for critical images or fonts. - **Avoid Lazy Loading**: Never set `loading="lazy"` on the LCP image. - **Fetch Priority**: Use `fetchpriority="high"` on the `<img>` tag. - **Same Origin**: Host critical resources on the same origin or use `<link rel="preconnect">`. ## 2. Eliminate Element Render Delay **Goal**: Ensure the LCP element can render immediately after its resource has finished loading. - **Minimize Render-Blocking CSS**: Inline critical CSS and defer non-critical CSS. Ensure the stylesheet is smaller than the LCP resource. - **Minimize Render-Blocking JS**: Avoid synchronous scripts in the `<head>`. Inline very small scripts. - **Server-Side Rendering (SSR)**: Deliver the full HTML markup from the server so image resources are discoverable immediately. - **Break Up Long Tasks**: Prevent large JavaScript tasks from blocking the main thread during rendering. ## 3. Reduce Resource Load Duration **Goal**: Reduce the time spent transferring the bytes of the resource. - **Optimize Resource Size**: Serve optimal image sizes, use modern formats (AVIF, WebP), and compress images/fonts. - **Geographic Proximity (CDN)**: Use a Content Delivery Network to get servers closer to users. - **Reduce Contention**: Use `fetchpriority="high"` to prevent lower-priority resources from competing for bandwidth. - **Caching**: Use efficient `Cache-Control` policies. ## 4. Reduce Time to First Byte (TTFB) **Goal**: Deliver the initial HTML as quickly as possible. - **Minimize Redirects**: Avoid multiple redirects from advertisements or shortened links. - **CDN Caching**: Cache static HTML documents at the edge. - **Edge Computing**: Move dynamic logic to the edge to avoid trips to the origin server. - **Back/Forward Cache**: Ensure pages are eligible for bfcache.

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optimization-strategies.md•2.1 KiB