249036 Optimize joomla speed

I have a problem with my joomla, it' s very slow. We have a really power dedicated server, and we use a CDN for shared the image and the video. The problem is that joomla use 12 -16 seconds for open one page. Maybe for too javascript, or because joomla make too request at server. I want that a very professional devolopers, analyze the site with this strument : Firefox 3.0 + Yslow (add-on) + Firebug For understand where is the problem... and study my situation for advise me a good solution for increse joomla speed ( of course without delete any module or mamboot) the site is [login to view URL] you can analize just now and propose me your advise, I select the too professional advise and analyze.