Phenom II x6 1055T, 8GB, HD 5870, Win7x64
Frame rate wise the game runs fine, but turn times get pretty bad on large maps. (late game turns of 30+ seconds are the norm; even early game turn times are noticeable)
Then you go back to Civ4, and are greeted with turn times of just a few seconds (early game turns are <1s), yet you have bigger maps, more units, and more challenging AI.
I don't think it's an exaggeration to say Civ6 turn times are ~10 times longer than Civ4's.
WTH is Civ6 doing with all those cycles! Sophisticated but ineffective, or just hideously inefficient?
Thankfully I can play windowed mode, and do something else while I wait..... but really that's not how it should be.