frame rate help

while making a game I have noticed that im getting some frame rate drops (from 60-30) when I add 7 moving models that each have collision spheres and rays, im not quite sure how to fix this. This problem gets worse the more I add.

also if any one can provide a link or just some simple guide lines for keeping the frame rate at a good level would be helpful.

My game requires that models and actors be placed into the scene when ever the user wants, so any advice on how to do this efficiently would also be helpful.

good place to start is to read the manual’s chapter about performance:
first step is to run pstats to find out what’s slowing your application down.
once you know whats slow you can start optimizing.

in your case i’d guess it’s collisions in relation with gemetry which is not optimized for collision.