Very ...
I mentioned, in the Patch Thread, that turn resolution was slower. Franciscus mentioned it may be because of the improved AI. OK. I can buy that.
But, it takes forever for the game to load ever since the 1.10 beta patches.
I am running Windows Vista SP1 with a fresh install of Patch 1.10a. The game takes between 10-15 minutes - literally - to load up. This was not the case before 1.10.
I have 4 Gigs of Ram on my machine.