I have been unable to play the game since .3 due to lag issues.  When I start a new game on a large map, my entire machine goes dead for a few minutes until the map appears.  If I try to select something or move the map It takes half a minute to respond.  If I try to quit the game, same.  If I try to alt tab out, same.  It can take me 5 minutes just to restart my system, even after I have closed the game.  Not sure what is going on.  I have Win 7 64 bit with 4 gigs of ram.