vmware fusion, you dissapoint me

Maybe the vmware folks haven't figured out how to utilize the Nvidia chips on the new macbooks, but the 3D performance in my virtual XP Pro machine sucks. I'm playing Civilization 4, a turn-based strategy game that uses 3D models and terrain, it's video requirements are pretty slim and yet there's lots of lag and clipping. I don't even want to try playing Fallout 3, a full-blown FPS-intensive game.