At Google, we focus constantly on speed; we believe that making our websites load and display faster improves the user's experience and helps them become more productive. Today, we want to share with the web community some of the best practices we've used and developed over the years, by open-sourcing 
Page Speed. 
Page Speed is a tool we've been using internally to improve the performance of our web pages -- it's a Firefox Add-on integrated with 
Firebug. When you run Page Speed, you get immediate suggestions on how you can change your web pages to improve their speed. For example, Page Speed automatically optimizes images for you, giving you a compressed image that you can use immediately on your web site.  It also identifies issues such as JavaScript and CSS loaded by your page that wasn't actually used to display the page, which can help reduce time your users spend waiting for the page to download and display.
Page Speed's suggestions are based on a set of commonly accepted 
best practices that we and other websites implement. To help you understand the suggestions and rules, we have created detailed 
documentation to describe the rationale behind each of the rules. We look forward to your feedback on the 
Webmaster Help Forum.
Posted by Richard Rabbat and Bryan McQuade, Page Speed Team
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