Geeeeezuz! Nice framerate there Shadow. One day we will all have nice cards like you do...until then....:(
Yes I'm having the same problem too Shadow. It has to do with map design and the limits of Q3map2. Try using HINT brushes to solve this problem. You can't use FOG here as far as I can tell it's an inside map and that would look silly. Need a HINT tuitorial? First off look at the default maps from RAVEN to see where and how they used them. Then...have a look at this page:
HINTS (
http://fps.brainerd.net/hintbrushes.htm)