Author Steve Souders, in his job as Chief Performance Yahoo, collected best practices while optimizing some of the most widely-visited page on the Web. Rules in High Performance Web Sites explain how you can optimize the performance of Ajax, CSS, JavaScript, Flash, and images that you've built your site - adjustments that are essential for any rich web application. Each performance rule is supported by specific examples, and code snippets are available on the web site companion book. The rules include how to: Making HTTP Requests Less Use Content Delivery Network Add an Expires Header Gzip Components Put stylesheets in Scripts Put Up in Down Avoid Making a Statement of JavaScript and CSS External CSS Reduce DNS lookups Decrease JavaScript Avoid Redirects Remove Duplicates Scripts Configure ETags Make Ajax cacheable If you're building pages for high traffic destination and want to optimize the experience of users visiting your site, this book indispensable. Between the book and Steve's YSlow extension, there is really no reason to have a slow web sites anymore. " -Joe Hewitt, Developer Firebug debugger and Mozilla's DOM Inspector "Steve Souders has done a fantastic job of art distillery, a large semi-mysterious to a set of concise, actionable, pragmatic engineering steps that will change the world of web performance."