Performance is not solved by one tool. Start by reducing what the first screen needs and ensuring the browser downloads appropriately sized images.
High-priority improvements
- 01Set accurate sizes on next/image
- 02Reduce unused client-side JavaScript
- 03Limit font families and weights
- 04Use server rendering and caching
- 05Measure Core Web Vitals on real devices
What matters is speed on the user’s network, not only in development.
Record measurements before and after each change so you can identify which work produced a real improvement.