Low FPS Problem

Hi, I have a problem with fps in only omsi.I have 10-11fps on Berlin V1.4 /Berlin-Spandau 1989.
My pc configuartion:
cpu: intel core 2 quad 2.60 @ 2,70 ghz
gpu: leadtek 8600GT 256 with overclock bandwith 30.7 gb/s, gpu clock 670 mhz.
ram: 3gb

Sorry for my bad english.




How is the problem ? watch gpu usage, 13%.

Bring down the AI traffic to about 300,people to about 150-300 and the textures below 1024 MB

Before photos.