Checkout cubeengine.com game engine(Choose SauerBraten)And tell me what game are you playing,Tremulous is shit, it uses quake 3 which is old and rusty,Go play a real FPS Game like the one above and abandon this shit(Tremulous)
I think it sucks because i am a 12 year old who has no life and cant play this game because its toooooooooooo hard and aliens are tooooooooooo stwong.