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Running Lighthouse
Analyzing Performance
Calculating Metrics
Performance Scores
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Performance
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Accessibility
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Best Practices
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SEO
Core Web Vitals
LCP
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Largest Contentful Paint
FID
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First Input Delay
CLS
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Cumulative Layout Shift
Additional Metrics
First Contentful Paint
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Speed Index
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Time to Interactive
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Total Blocking Time
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Opportunities for Improvement
Diagnostics
Speed Test Failed
About Core Web Vitals
LCP - Loading
Largest Contentful Paint measures loading performance. Good: <2.5s, Needs Improvement: 2.5-4s, Poor: >4s
FID - Interactivity
First Input Delay measures interactivity. Good: <100ms, Needs Improvement: 100-300ms, Poor: >300ms
CLS - Visual Stability
Cumulative Layout Shift measures visual stability. Good: <0.1, Needs Improvement: 0.1-0.25, Poor: >0.25