Page Speed is a new Firefox addon from Google. As stated in the announcement the tool had already long been used internally by Google. It extends the functionality of Firebug.
The addon requires Firefox 3.0 and Firebug addon. Page Speed was used internally by Google to optimize web pages and to optimize the performance. It examines the code of a Web page and automatically makes suggestions how the speed can increase. If the page For example, many graphics, the width or height will shrink, created .
The addon also recognizes the JavaScript and CSS from the page.

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