Free Performance Tool
Core Web Vitals Auditor
Measure your website's Core Web Vitals and performance metrics with Lighthouse. Get detailed analysis of LCP, CLS, TBT, and more with actionable AI-powered recommendations.
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Grade
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Core Web Vitals
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LCP
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CLS
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TBT
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INP
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Additional Metrics
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First Contentful Paint
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Speed Index
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Time to Interactive
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Server Response (TTFB)
What Are Core Web Vitals?
LCP - Largest Contentful Paint
Measures how long it takes for the largest content element to load. Target: under 2.5 seconds.
CLS - Cumulative Layout Shift
Measures visual stability - how much the page layout shifts unexpectedly. Target: under 0.1.
TBT - Total Blocking Time
Measures how long the main thread is blocked. Target: under 200ms for good interactivity.
INP - Interaction to Next Paint
Measures responsiveness to user interactions. Target: under 200ms for a responsive experience.
Understanding Your Performance Score
| Score | Grade | Description |
|---|---|---|
| 90-100 | A+/A | Excellent performance - optimized for users and search engines |
| 70-89 | B | Good performance with room for improvement |
| 50-69 | C | Needs improvement - users may experience slow loading |
| 30-49 | D | Poor performance - significant optimizations needed |
| 0-29 | F | Critical issues - immediate action required |
Note: Performance scores are based on Google Lighthouse and can vary between runs due to network conditions and server response times.
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