Im sorry i dont know.
In my example i have currently only about 10 units on each side (1 scanner + several turrets vs a bunch of fighters. I don't have FPS Problems so far (i limit it to 60 and it never drops below).
When i have my system up and running again i will test it with more units.
My idea was to have one a bit more complex function and several "small" ones instead of a bunch of medium sized ones.
But my project is still in a prealpha version, so i dont have much experience in performance issues.