Google has provided a new tool in Google Webmasters to help website developers, internet marketing agencies, SEO experts, and others that monitor their site performance with their Webmaster Tools. This tool is under Google Labs and will analyze how fast your site is. With the new Google algorithm starting to hit one data center at a time and launching after the holidays this is going to be a very important tool to make sure your site is faster then your competitors if you would like to rank better.
Here is a video from Google’s Page Speed landing page.
Also, there are plugins for Mozilla browser where you can download their page speed tool that also requires Firebug if you don’t have that already.
