Core Web Vitals measure three things your visitors actually feel: how quickly the main content appears, how fast the page responds when they tap something, and how much the layout jumps around while it loads. They feed into ranking, but the better argument for fixing them is that slow pages lose sales on their own.
On a typical slow site, five changes do the bulk of the work. Compress the images and lazy-load anything below the fold. Set explicit dimensions on media so nothing jumps. Preconnect and swap the web fonts. Defer the JavaScript that is not needed for the first screen. Cache at the edge. None of that requires a rebuild.
Measure with real-user data rather than lab scores alone, then put a performance budget in the build pipeline so nobody has to remember it. Fast is a habit, not a project.
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