What you need to know
A Lighthouse score can highlight large images, unused JavaScript, render delays, and layout shifts, but one run is not a complete picture. Device and network conditions affect results.
How to apply it
Test a production URL at a consistent viewport, inspect the diagnostics behind the score, fix the largest user-facing issue first, and repeat. Compare a few runs and watch real field metrics over time.
Common mistake to avoid
Do not treat a perfect score as the only goal. Preserve accessibility, readable content, and useful features while reducing measurable delays.