Arsenal of Democracy: A Hearts of Iron Game
Apparently, the game is faulty and can't run faster than normal speed. It is even mentioned in a few reviews for the game.
steam has an update for your problem
or try the latest patches
You should go AoD's forum part at Paradox Interactive.
Once you have registered your game (with the code you received here), you can post in the technical support part.
There they can answer your question.
I had no problem with AoD slowing down or having problems at higher speeds. So it is not a general problem with the game, it is most probably related to some driver issue.
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