I played Rage on the PC and immediately noticed extremely laggy textures as well as constant framerates below 20 FPS.

I've got an extremely high-end ATI CrossfireX desktop and I'm not sure if the poor performance is being caused by game glitches or just the fact that this game is torturously taxing on even the fastest PC hardware possible. Even more so than Crysis, GTA4, and Metro 2033.

The game runs so poorly it isn't fun to play.

I certainly hope that ID software releases a patch fixing this pressing problem.