This is from the forecast site:
Quote:
A map compiler switch for activating or deactivating BSP tree culling. Implementing an adaptive binary tree for scene management without BSP tree. Import of arbitrarily shaped geometry from model editors like MAX or MAYA. New faster rendering kernels for entities and level geometry.
The state is called "in beta test".
So it sounds to me that there will be a solution of this problem in a future version.