This has been going on for a few days now, and it's more annoying for the fact that the server is not actually too busy.
When that message pops up, it's showing 6 or 7 queries in the bottom bar.
Most of the heavy lifting has already been done at that point and all that needs doing is to return the page.
If the server busy message was shown with zero queries, the server would return to normal load a lot faster. You don't need customized themes for each user to show this message.
Whatever code is returning the server busy message, move it above the code for checking cookies for logins etc. and things should improve a bit.
Edit: Just realised this is in bittorrent section. Just posted in the first page that would actually load.