Using Page Speed
http://code.google.com/speed/page-speed/docs/using.html

Using 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."

ools > Firebug > Open Firebug

You may have heard that here at Google we're obsessed with speed, in our products and on the web. As part of that effort, today we're including a new signal in our search ranking algorithms: site speed. Site speed reflects how quickly a website responds to web requests.

@dworni Danke fürs Kompliment! Dieses Merkmal gewinnt an Gewicht, wenn man Google's Ranking Algorithmus betrachtet: http://bit.ly/baZCCs – cmsbox (cmsbox) http://twitter.com/cmsbox/statuses/12153045861

RT @kadavy WordPress Optimization: How I Reduced Page Load Time by 75% http://bit.ly/d2Gfga

page speed optimization yslow

GTmetrix can help you develop a faster, more efficient, and all-around improved website experience for your users.