LCP
Largest Contentful Paint
Good: <2.5s | Needs Improvement: 2.5-4s | Poor: >4s
FCP
First Contentful Paint
Good: <1.8s | Needs Improvement: 1.8-3s | Poor: >3s
CLS
Cumulative Layout Shift
Good: <0.1 | Needs Improvement: 0.1-0.25 | Poor: >0.25
TTFB
Time to First Byte
Good: <800ms | Needs Improvement: 800-1800ms | Poor: >1800ms