Performance Score
example.com
94
out of 100
2.1s
LCP
Good
0.08
CLS
Good
120ms
TBT
Good
Deep Performance Analysis
Powered by Google Lighthouse running in a real Chromium browser via Playwright. No simulated data.
Core Web Vitals
Measure LCP, CLS, and TBT — the metrics Google uses for search ranking. Each rated as good, needs improvement, or poor.
Full Timing Metrics
Track all 7 key metrics: TTFB, FCP, LCP, Speed Index, Time to Interactive, Total Blocking Time, and Cumulative Layout Shift.
Image Optimization
Detect oversized images, unoptimized formats, and missing lazy loading. Get byte savings estimates and format recommendations.
Resource Analysis
Find render-blocking resources, unused CSS/JS, and unminified code. See exactly how many milliseconds each issue costs.
Server & Caching
Analyze server response time, caching policies, text compression, and CDN configuration with specific fix instructions.
Opportunities & Diagnostics
Get prioritized recommendations with estimated savings in milliseconds and bytes. Each includes step-by-step fix instructions.
7 Metrics We Track
Industry-standard performance metrics rated against Google's thresholds for good, needs improvement, and poor.
Largest Contentful Paint
How fast the main content loads
Cumulative Layout Shift
Visual stability while loading
Total Blocking Time
Main thread responsiveness
First Contentful Paint
Time to first visible content
Time to First Byte
Server response speed
Speed Index
How quickly content is visually populated
Time to Interactive
When the page becomes fully usable
Optimization Opportunities
Each opportunity includes estimated savings in milliseconds and bytes, plus step-by-step fix instructions.