if youve played operation flashpoint you will see that you can have 80-90 men in scene, with ample trees, buildings etc.
How do they do this?
Objects further away are represented by low res modals. As you get closer they are changed into high res models.
For example
A house down the road ia ascessable. However, until you get there, who cares if it is an empty box with a roof on. As the player gets closer swap it with a complex version you had hidden, as above.
In DBPro if you put your close up models in a position where the camera will never render them because thay are off screen this can help towards render speed.
Although I think hiding an object should do this but last time I checked it out the CPU behaved like it was still being rendered.
Also, if you reduce camera range this can improve performance, however I think a bug does not allow this to work at the moment. ie the clipping function is not perfected. Maybe patch 4 will solve this? Fog can sometimes add atmosphere to your game...and hide the reduced camera range.
MOST IMPORTANT TIP I CAN GIVE U!!!
patch 4 will allow a 3d frame which runs at 20fps to run at 300 fps. If I'm wrong Lee Bamber will eat my hat!!!