Understanding Lighthouse Scoring
Demystify how Lighthouse turns raw measurements into the 0-100 Performance score, including metric weights, scoring curves, and why your score can fluctuate.
What the Number Means
The Lighthouse Performance score is a 0-100 summary of several lab metrics. It is a weighted blend, not a single measurement, so improving one metric does not always move the score the same amount.
The Weighted Metrics
The score is built from a handful of metrics, each with a weight. The biggest contributors are typically Largest Contentful Paint, Total Blocking Time, and Cumulative Layout Shift.
All lessons in this course
- Introduction to Google Lighthouse
- Running Your First Audit
- Interpreting Lighthouse Reports
- Understanding Lighthouse Scoring