Freakin' Lag!!!!!!!!!!!

[ZeroLogix]

Alright, I'm in the beginning stages of a level. Everything looks great and works fine, but once I add enemies it all goes to shit and starts lagging. I can't have 30 creatures running around without major problems (and I'm talking MAJOR). (By everything works fine, I'm talking about some huge freaking doors that open and close, water sections, explosions, movies, some gravity rooms). Everything runs smooth until the bad guys start appearing. What can be possible causes of the lag. I'm using a kick ass computer (compared to what the game requires) so I don't know what's going on. I may not be including enough info to receive a straight answer, so let me know what other details I need to give about the level for possible lag problems. :cry2:

[Shrinker]

If it is possible, please post the map here for examination.

[Fiendian]

Have you sectored the map properly?
That can make the difference.