You really cant. It makes the server crash more because they are running more seperate game mods/maps. Foxes used to play DC on their main server, and it crashed every day. I think that is just for a hole new set of maps though
running different maps doesnt crash a server my old clan used to run a quite a phew of different maps on its old server and it never used to crash so it must just be other mods that make em crash