Well the 1.2 patch was released last week and did clear some things up.
But the game will still bog down when "the war" actually starts, just not as bad as before. The solution is to save, exit, and reload.
There are a lot of issues if you want to play a "historical" game, for instance there's pretty much a 0% chance that an AI controlled GER will ever initiate Barbarossa.
I'm still having a lot of fun with it though, and some of the mods help to sort the more egregious problems out. Unfortunately, the next patch won't be out until early Nov.
Edit - ARMA II is the most worthless game I've ever spent $50 bar none, just terrible.