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Website Speed Checklist
Comprehensive checklist to improve your website loading speed
Your Progress
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Images
Compress all images using tools like TinyPNG or ImageOptim
Use modern formats like WebP or AVIF
Implement lazy loading for below-the-fold images
Specify image dimensions to prevent layout shift
Use responsive images with srcset
CSS & JavaScript
Minify CSS and JavaScript files
Remove unused CSS (use PurgeCSS or similar)
Defer non-critical JavaScript
Use async loading for scripts when possible
Bundle and tree-shake JavaScript modules
Server & Hosting
Enable GZIP or Brotli compression
Use a Content Delivery Network (CDN)
Enable browser caching with proper headers
Use HTTP/2 or HTTP/3 protocol
Optimize server response time (TTFB)
Fonts
Use font-display: swap for web fonts
Subset fonts to include only needed characters
Preload critical fonts
Consider using system fonts for faster loading
Use WOFF2 format for web fonts
Core Web Vitals
Optimize Largest Contentful Paint (LCP < 2.5s)
Minimize First Input Delay (FID < 100ms)
Reduce Cumulative Layout Shift (CLS < 0.1)
Optimize Time to First Byte (TTFB < 800ms)
Improve First Contentful Paint (FCP < 1.8s)
Pro Tips
• Use Google PageSpeed Insights to measure your current performance
• Start with the highest-impact items first (images and JavaScript)
• Test your site on real devices, not just desktop simulators
• Monitor performance regularly, not just once