Last Updated: November 21, 2025
Lighthouse
Web performance and quality auditing
Audit Categories
| Item | Description |
|---|---|
Performance
|
Loading speed metrics |
Accessibility
|
A11y best practices |
Best Practices
|
Web standards |
SEO
|
Search optimization |
PWA
|
Progressive web app |
Performance Budget
|
Size and timing budgets |
Running Lighthouse
npm install -g lighthouse
Install globally
lighthouse https://example.com
Audit URL
lighthouse https://example.com --view
Open report
lighthouse https://example.com --output html
HTML report
lighthouse https://example.com --only-categories=performance
Specific category
Key Metrics
| Item | Description |
|---|---|
FCP
|
First Contentful Paint |
LCP
|
Largest Contentful Paint |
TBT
|
Total Blocking Time |
CLS
|
Cumulative Layout Shift |
SI
|
Speed Index |
TTI
|
Time to Interactive |
Best Practices
- Test in incognito mode
- Test on mobile networks
- Set performance budgets
- Fix issues by priority
💡 Pro Tips
Quick Reference
Run Lighthouse in CI/CD to catch regressions