I would say that overall, G&K has definitely improved the time between turns. When i hit next turn it doesn't seem to take an eternity to get to the next turn. I'm running on a GTX 560 and a hexcore FX 6100 and 4gb ddr3 ram. I think its safe to say that any lag has nothing to do with my system. That being said, it could simply be the game that has the problems and you might not be able to do anything to really remedy the performance issues. Turn off background programs, maybe overclock your processor, turn all the graphics options down or off. If that doesn't work maybe you need an upgrade or maybe, like i was saying before, it has nothing to do with your system. What are your specs?