Last Updated: November 21, 2025
Metric Breakdown
| Metric | Goal |
|---|---|
FCP
|
Render first text/image (<2s) |
LCP
|
Largest element paint (<2.5s) |
CLS
|
Avoid layout shifts (<0.1) |
Optimization Commands
preload fonts/images
Prioritize critical assets
compress assets
Brotli/gzip static files
use IntersectionObserver
Defer offscreen loads
Monitoring
Collect RUM data, run Lighthouse audits, and keep budgets for bundle size + TBT.
💡 Pro Tip:
Monitor lab + field data, focus on LCP/CLS first, and prefer preloading for critical assets.