How to prevent more latency in a server.

[rEsTnPeAcEz]

I know the common reasons for lag; Too many apps on with a server, things that are modified in a map file which causes lag, graphics settings are turned up to the maximum, and so on. You can prevent these things from causing lag but I want to know how to prevent lag by modifying the .map file in Halo Demo. I've tried many things like turn down the ROV of a weapon or take off effects but it doesn't seem to work. So if you know any suggestions please tell me.
Thank You.

[Sparky]

Reduce the number of shaders in the map by referencing similar shaders in the BSP.
Numbers of shaders and triangles visible on-screen at any one point relatively greatly affects lag.

[rEsTnPeAcEz]

Reduce the number of shaders in the map by referencing similar shaders in the BSP.
Numbers of shaders and triangles visible on-screen at any one point relatively greatly affects lag.

Any other ways?

[Sparky]

When you start the game, hold down option and turn off all the graphics settings. In the game, turn off particles.
Reduce the number of scenery chunks in the scenery tag (the number of rocks and such that you see in the game).
See the game engine notes in the Halo Editing Kit PC reference: http://www.halodemomods.com/hek/index.html (Click on "General Level Design Information".)

[rEsTnPeAcEz]

Thank you.