Hmm, another thought could be that there's simply too many people in that map at the time..
Although, I'm unfamiliar with that map name...
Make sure that the map itself have downloaded and installed correctly and that you're not missing any important files.
You can also try switching rendering subsystems and seeing if that does the trick?
To switch it outside of then game, go to your Main Feral-Heart Folder and open up the orge.cfg file and on the top bar, either put 'Direct3D9 Rendering Subsystem' or 'OpenGL Rendering Subsystem' and see if that possibly does the trick.