I have seen people complain about them having to wait a considerable amount of time after having pressed the end turn button, but I have yet to see this happen. Though I will admit that I have only played the demo since the full game doesn't unlock for me until the 23rd. For me, it takes about 1-2 seconds most of the time for a turn to pass. Does large amounts of RAM make a difference? I personally have 5 GB of RAM and am using a 64-bit version of Windows 7. EDIT: Speaking of which, is there any word on a possible 64 bit version of the game?