I have been playing a bit of UT recently but I'm really struggling to get it to run well. I just can't get it to run smoothly. I have tried D3D and the latest utglr opengl renderer. The best I have got is with the utglr but it still isn't smooth. It isn't a lack of frames as I can limit it to 60 or 100 and it stays fairly constant, it just doesn't feel nice.