YSlow

YSlow analyzes web pages and suggests ways to improve their performance based on the following set of rules for high performance web pages: * Minimize HTTP Requests * Use a Content Delivery Network * Avoid empty src or href * Add an Expires or a Cache-Control Header * Gzip Components * Put StyleSheets at the Top * Put Scripts at the Bottom * Avoid CSS Expressions * Make JavaScript and CSS External * Reduce DNS Lookups * Minify JavaScript and CSS * Avoid Redirects * Remove Duplicate Scripts * Configure ETags * Make AJAX Cacheable * Use GET for AJAX Requests * Reduce the Number of DOM Elements * No 404s * Reduce Cookie Size * Use Cookie-Free Domains for Components * Avoid Filters * Do Not Scale Images in HTML * Make favicon.ico Small and Cacheable