Performance work should begin with real user paths, not a single laboratory score. Identify the pages that attract search traffic or generate enquiries, then measure their largest content, interaction delay, and layout stability on representative devices.
Large hero images, unoptimised screenshots, custom fonts, consent tools, analytics, and embedded services are common causes of slow first views. Correct sizing, modern formats, priority loading, font discipline, and a smaller script budget often produce the largest gains.
INP improves when long JavaScript tasks are broken up and unnecessary client-side work is removed. CLS improves when images, banners, cards, and dynamic content have stable dimensions before they load.
The goal is a fast commercial experience, not a perfect score in isolation. Measure after deployment, monitor regressions, and include performance in the content and release process.