Fix the causes, then prove the result
- Lab and field data pinpoint what is slowing the site, not guesses from a generic checklist.
- The heaviest wins first: image optimization, caching, and a CDN before deeper code work.
- Render-blocking scripts deferred, unused code removed, and server response time tuned.
- Before-and-after Lighthouse and Core Web Vitals scores so you can see exactly what changed.
