http://bugs.winehq.org/show_bug.cgi?id=10485
--- Comment #4 from Ben Slackin ben.slackin@gmail.com 2007-11-27 21:17:35 --- This is just a comment from someone who had the same problem in the past. I "solved" it by buying a better video card. With my new nVidia GeForce 7950 GT the rain does not slow the play down very much. A workaround is to turn off rain in Oblivion.ini with the bPrecipitation=0 setting.