What is Page Speed?

Page Speed is an open-source Firefox/Firebug Add-on. Webmasters and web developers can use Page Speed to evaluate the performance of their web pages and to get suggestions on how to improve them.

How does Page Speed work?

Page Speed performs several tests on a site's web server configuration and front-end code. These tests are based on a set of best practices known to enhance web page performance. Webmasters who run Page Speed on their pages get a set of scores for each page, as well as helpful suggestions on how to improve its performance.

Why should you use Page Speed?

By using Page Speed, you can:
Make your site faster.
Keep Internet users engaged with your site.
Reduce your bandwidth and hosting costs.
Improve the web!

http://code.google.com/intl/en-EN/speed/page-speed/

Note: Firefox download only.