Core Web Vitals without the guesswork

A repeatable process for finding the one or two things that are actually slowing your site down.

Field data first: it reflects real users on real networks. Lab tools are for diagnosis, not for judging whether you have a problem.

For Largest Contentful Paint, identify the element, then check whether it is discoverable in the initial HTML, correctly sized and preloaded. Most improvements come from that single element.

Interaction delays usually trace to long tasks during hydration. Ship less JavaScript on the critical path, split routes, and defer anything not needed for the first interaction.

Layout shift is nearly always missing dimensions on images and embeds, or fonts swapping without a matched fallback. Both are cheap fixes with a visible score impact.