Lighthouse Audits and Scoring
Run Lighthouse in DevTools or CI, read the performance score and diagnostics, and prioritise the opportunities with the highest savings.
What Is Lighthouse?
Lighthouse is Google's open-source audit tool that simulates a page load and scores it across Performance, Accessibility, Best Practices, SEO, and PWA categories. Built into Chrome DevTools and runnable from CLI or CI.
Running Lighthouse in DevTools
Open DevTools, click the Lighthouse tab, choose categories and device (mobile/desktop), click 'Analyze page load'. The simulated test takes around 30 seconds.
All lessons in this course
- Core Web Vitals: LCP FID CLS
- Lighthouse Audits and Scoring
- Image Optimization: lazy loading formats WebP
- Code Splitting and Lazy Routes