I've been trying out Civilization IV on my fiancé's PC, and like the game enough that I want to play it on my Mac. I just downloaded the demo today, and wow. So slow as to be well-nigh unplayable. Here's my system (and yes, I read the G5 discussion below): 1.8 GHz PPC G5 iMac OS 10.3.9 1GB RAM GeForce FX 5200 with 64MB VRAM Now the readme file says that the rendering problems on this particular machine are only in the demo and not in the game, so that explains that. But I was also getting some horrible sound problems, constant loud speaker pops. And it ran like molasses on the very lowest graphics settings and lowest resolution; forget trying to play in 1680 x 1050 like I can on the PC with no issues. (And this is not an up-to-date PC either.) I realize that my settings are the minimum recommended for the game so I can't expect peak performance. But other than the sound and rendering problems, does the demo's performance reflect what it'll be like trying to play the real game? If so, guess I'm playing it on the PC until I can afford that new Intel iMac.