Forums directory page times out before fully loaded

Recently we upgraded to a dedicated server because of loading errors as a result of our site growing so quickly. Now, however, I have a brand new server which should have more than sufficient specs to handle not only wpmu but also buddy press but yet my forum directory page is already not loading all the way. Here's the page (though I imagine it may not work the same all the time):

Also, a screen capture to show what's happening:

This is frustrating as we've spent weeks now trying to get the right specifications together because we were told upgrading to our own server would fix all these issues. Any thoughts or ideas? I don't want to "launch" this new site only to have the same errors and problems happen within days of our members getting on.

Thanks for any help on this matter!