I have got the same problem in WAW. When I have 2 TFT displays attached the game slows down. The problem is I like to watch TV on the 2nd display while the AI makes it turn or just browse the internet.
With only 1 display I have no performance issue.
I run the game on XP SP2 , window mode and with 1680*1050 size.
Will there be a fix available ?