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Mobile Performance Checker

Analyze and optimize your mobile web performance

33
Performance Score
Estimated load time: 4.5s on Fast 3G

Network Conditions

Your Metrics

Total Size: 900KB / 1500KB

Category Scores

Images
38
Image size is optimized!
JavaScript
25
JavaScript size is optimized!
CSS
50
CSS size is optimized!
HTTP Requests
20
Request count is optimized!

Core Web Vitals Reference

Largest Contentful PaintGood: < 2.5s

Time to render largest content element

First Input DelayGood: < 100ms

Time from first interaction to browser response

Cumulative Layout ShiftGood: < 0.1

Visual stability metric

First Contentful PaintGood: < 1.8s

Time to first content render

Time to First ByteGood: < 0.8s

Time to receive first byte from server

Optimization Checklist

Images

  • ✓Use modern formats (WebP, AVIF)
  • ✓Implement lazy loading
  • ✓Use responsive images (srcset)
  • ✓Compress images (80-85% quality)
  • ✓Use CDN for image delivery

JavaScript

  • ✓Code splitting and lazy loading
  • ✓Tree shaking unused code
  • ✓Minification and compression
  • ✓Use dynamic imports
  • ✓Defer non-critical JS

CSS

  • ✓Remove unused CSS
  • ✓Minify CSS files
  • ✓Use critical CSS inline
  • ✓Load non-critical CSS async
  • ✓Use CSS containment

Fonts

  • ✓Use font-display: swap
  • ✓Limit font variations
  • ✓Subset fonts
  • ✓Use system fonts when possible
  • ✓Preload critical fonts

Network

  • ✓Enable HTTP/2 or HTTP/3
  • ✓Use compression (Gzip/Brotli)
  • ✓Implement caching strategy
  • ✓Use CDN
  • ✓Minimize redirects

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Frequently Asked Questions - Mobile Performance Checker