Mainly R_speeds lag etc are down to the areas of your map when there is a lot about. Rooms that can see down long corridors or rooms that dont have vertexed corners can create lag. Wpoly count for a lot which will slow you map down the higher you go. Run the map, turn cheats on and type "R_speeds 1" If you Wpolys are reaching higher than 400-500 *depending on size of room* it can lag.
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Comments
ND
wpolys should be under 700, and epolys aren't all that important in your case, also, what is the fps?