any objects not visible in a view are not rendered, neither are thoese behind walls(bsp system). if you want to increace the frame rate by decreacing the clip range use a fog to cover up the fact (if it is an outdoor level. if you are doing an indoor level then have as many corners as posible to hide as much of teh level without letting the user know that is waht you are doing. what type of level is it you are tryig to do?... indoor, outdoor etc is it mountainous or is it flat? .. are there many buidings...?