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Performance Budget Calculator
Define Core Web Vital targets, bundle size budgets, and connection simulations
📥 Import Lighthouse
📤 Export Budget
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🌐 Connection Speed
Slow 3G
4G LTE
Fast
Fiber
↓ 1.6 Mbps
Latency: 300ms
📊 Core Web Vitals Budget
LCP (Largest Contentful Paint)
2500ms
Good ≤2.5s
Needs work ≤4s
Poor >4s
INP (Interaction to Next Paint)
200ms
Good ≤200ms
Needs work ≤500ms
Poor >500ms
CLS (Cumulative Layout Shift)
0.10
Good ≤0.1
Needs work ≤0.25
Poor >0.25
TTFB (Time to First Byte)
800ms
Good ≤800ms
Needs work ≤1.8s
Poor >1.8s
TBT (Total Blocking Time)
200ms
Good ≤200ms
Needs work ≤600ms
Poor >600ms
📦 Bundle Size Budget
JavaScript (gzipped)
170 KB
Load time on selected connection: ~0.9s
CSS (gzipped)
50 KB
Load time on selected connection: ~0.3s
Images (total)
500 KB
Load time on selected connection: ~2.5s
Total Page Weight
720 KB
Estimated total load: ~3.6s on Slow 3G
💡 Optimization Tips