03 - LCP Optimization: Image Preloading, Critical CSS and SSR

Largest Contentful Paint must occur within 2.5 seconds for optimal user experience and good Google ranking. The four highest-impact strategies — image preloading, critical CSS inlining, font preloading with display:swap and SSR — analysed with practical examples.

What you'll learn

• Come identificare l'elemento LCP con Chrome DevTools e Lighthouse
• Image preloading con <link rel="preload"> e l'attributo fetchpriority="high"
• Critical CSS: cosa e, come estrarlo e come includerlo inline nell'HTML
• Font preloading con font-display: swap e preconnect
• Come SSR (Server-Side Rendering) migliora strutturalmente il LCP

This article is part of the Core Web Vitals series on federicocalo.dev.

Read the full article

The complete article (13 min read) with code examples, diagrams, and practical exercises is available here:

➡️ 03 - LCP Optimization: Image Preloading, Critical CSS and SSR

https://federicocalo.dev/en/blog/lcp-optimization-image-preloading-critical-css

By Federico Calò — Software Developer & Technical Writer