Thanks for the help. Point 1&3 plus the maximum pre-rendered frames to 8 boosted my system from 25 to 38-40.
Everything on the left on very high, middle on high, right side on high resolution , res at 1600x1000. Distance 3k.
My pc: GTX260, Q6600 @ 3.2
edit: ok 40fps in spmission and in the editor preview i just hit 70 while flying around and stuff. It runs very very smooth now.