Google anounced today on their blog that they introduce to developers an enterly tool, google developer were using on google websites to test its speed.

The new tool is an Add-on to FireBug, and sure on just Firefox.

From the first look we can say its a tool the same as YSlow from Yahoo.

More details about the tool there:

http://google-code-updates.blogspot.com/2009/06/introducing-page-speed.html

http://www.techcrunch.com/2009/06/04/google-opens-up-internal-speed-tool-to-the-public/

And Download here