Most slow sites share the same handful of problems. These five fixes give the biggest gains.
The five fixes
- Serve the largest image in modern formats with the right size and priority.
- Load fonts with swap and only the weights you use.
- Send less JavaScript: remove what the page does not need.
- Cache pages and data close to the visitor.
- Reserve space for images and embeds to stop layout shift.
Measure on real devices
Lab scores are a start. Check real-user data and a mid-range phone, because that is what your customers hold.