Yslow recommendations for webpage optimizations

YSlow

• Add Expires headers
• Avoid AlphaImageLoader filter
• Avoid CSS expressions
• Avoid empty src or href
• Avoid HTTP 404 (Not Found) error
• Avoid URL redirects
• Compress components with gzip
• Configure entity tags (ETags)
• Do not scale images in HTML
• Make AJAX cacheable
• Make favicon small and cacheable
• Make fewer HTTP requests
• Make JavaScript and CSS external
• Minify JavaScript and CSS
• Put CSS at the top
• Put JavaScript at bottom
• Reduce cookie size
• Reduce DNS lookups
• Reduce the number of DOM elements
• Remove duplicate JavaScript and CSS
• Use a Content Delivery Network (CDN)
• Use cookie-free domains
• Use GET for AJAX requests