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Performance Examples

Compare fast and slow loading websites to understand what makes a difference in performance

⚡ Fast Loading Websites

These websites demonstrate excellent performance practices

Static HTML Sites

Excellent

Simple static sites load almost instantly with minimal resources

  • ✓Minimal JavaScript
  • ✓Optimized images
  • ✓Efficient CSS
  • ✓Fast TTFB
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Optimized Modern Sites

Very Good

Modern frameworks with proper optimization techniques applied

  • ✓Code splitting
  • ✓Lazy loading
  • ✓CDN delivery
  • ✓Resource compression
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⚠️ Common Performance Issues

These patterns often lead to slow loading times

Heavy Third-Party Scripts

Needs Work

Sites loaded with analytics, ads, and widgets can significantly slow down

  • ✗Multiple analytics tools
  • ✗Social media widgets
  • ✗Chat widgets
  • ✗Advertisement scripts

Impact: Can add 2-5 seconds to page load time

Unoptimized Images

Poor

Large, uncompressed images are one of the biggest performance killers

  • ✗Multi-MB image files
  • ✗Wrong format (PNG for photos)
  • ✗No lazy loading
  • ✗No responsive images

Impact: Can add 5-10 seconds on slow connections

Render-Blocking Resources

Needs Work

JavaScript and CSS that blocks the page from displaying content

  • ✗Synchronous scripts in <head>
  • ✗Large CSS files
  • ✗Web fonts without display:swap
  • ✗No critical CSS inlining

Impact: Delays First Contentful Paint by 1-3 seconds

Slow Server Response

Poor

Slow backend processing or database queries delay everything

  • ✗High TTFB (>600ms)
  • ✗No caching
  • ✗Expensive database queries
  • ✗No CDN

Impact: Adds 1-5 seconds before anything loads

Key Takeaways

What Makes Sites Fast:

  • • Minimal JavaScript and CSS
  • • Optimized, compressed images
  • • Efficient caching strategies
  • • CDN for static assets
  • • Code splitting and lazy loading
  • • Fast server response times

What Makes Sites Slow:

  • • Too many third-party scripts
  • • Large, unoptimized images
  • • Render-blocking resources
  • • No compression or minification
  • • Slow server/database queries
  • • Poor mobile optimization

Try it yourself: Use LoadTime Analyzer to compare different websites and see these principles in action.

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