Performance is not merely a test score. What matters is when users see primary content, how quickly interactions respond and whether the layout shifts during loading.
Serve properly sized WebP or AVIF images, lazy-load off-screen media and reserve image dimensions. Reduce unused JavaScript, defer non-critical work, limit font variants and cache static assets.
Track outcomes with real-user data in GA4 and Search Console, not laboratory tests alone.
A Practical Guide to Web Performance and Core Web Vitals
