I see so many people having this problem and it puzzles me to no end. I have never had lag or long turn time issues with Civ 5--not vanilla, not G&K, not with mods or without (don't use info addict, tho)--and my system is nothing special. That said, I figured out from the get-go that I'm playing this for the game and not for the eye candy, so I have pretty much everything non-essential for gameplay turned off/down...video options are all set to low/minimum, sound is turned off across the board (although I'm usually streaming music in the background while I play), and I use quick combat (I do allow movement animations, though). OP, are you just talking about having to sit through AI moves? Because those are the only times when I see anything even approaching 30 seconds per turn; when my LOS includes some AI battle going on, which rather ironically means that my late-game turns tend to take longer on smaller maps than on huge ones. When I do end up having to sit through that for a few turns I'll amuse myself by trying to figure out if AI1 will actually take AI2's city, and when that gets old, check Twitter/texts/whatever.