on higher quality settings, moving is very very choppy, kind of as if playing on a very laggy server. this is not to be confused with a low framerate, my framerate stays consistently high in these environments, and staying still and looking at objects rotating shows that they are not rotating in a choppy manner. i really have no clue what is causing this, but it wasn't present in the last version. it happens regardless of level, unless the level doesn't take advantage of any of the higher quality features.
i'm running an AMD athlon 3000+
1.5 GB DDR RAM
and an out of the box over clocked 7600GT
windows xp.
I don't know if this is also a problem in the linux version, as i've yet to compile from source to get around the GLIBC_2.4 issue