Recommendations

PageSpeed

• Avoid a character set in the meta tag
• Avoid bad requests
• Avoid CSS @import
• Avoid CSS expressions (deprecated)
• Avoid document.write (deprecated)
• Avoid Flash on mobile webpages (deprecated)
• Avoid landing page redirects
• Avoid Plugins (deprecated)
• Combine external CSS (deprecated)
• Combine external JavaScript (deprecated)
• Combine images using CSS sprites
• Defer loading of JavaScript (deprecated)
• Defer parsing of JavaScript
• Enable gzip compression
• Enable Keep-Alive
• Improve server response time (deprecated)
• Inline small CSS
• Inline small JavaScript
• Leverage browser caching
• Leverage proxy caching (deprecated)
• Make landing page redirects cacheable (deprecated)
• Minify CSS
• Minify HTML
• Minify JavaScript
• Minimize cookie size (deprecated)
• Minimize DNS lookups (deprecated)
• Minimize redirects
• Minimize request size
• Optimize images
• Optimize the order of styles and scripts
• Parallelize downloads across hostnames (deprecated)
• Prefer asynchronous resources
• Put CSS in the document head
• Remove query strings from static resources
• Remove unused CSS (deprecated)
• Serve resources from a consistent URL
• Serve scaled images
• Serve static content from a cookieless domain (deprecated)
• Specify a cache validator
• Specify a character set early
• Specify a Vary: Accept-Encoding header
• Specify a viewport for mobile browsers (deprecated)
• Specify image dimensions
• Use an application cache (deprecated)
• Use efficient CSS selectors (deprecated)

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