bad performance solved !!!!!!!
 

Hi to all.
I have solved bad frame & performance problem on my pc.
I have c2d e6400@3.2ghz,p5b,2g ram,9800gtOC
I was having like 20-30fps no matter of the graphic settings.
Then i set up advanced HD audio to OFF in audio menu,now i get constant 60-70+ fps,lag is gone.
Hope this will help others.

Nice , it definitely improved my performence significantly . Thanks for the tip !

That realy strange.. on my pc it dosent help so much. it dosent go more than 32 fps on medium settings 1024x768 even if HD audio is off...

I suppose it helps if you don't have an EAX-compatible sound card... It's good to know though, in other games the default setting is not the highest one usually. I wonder how many people would not complain about the game's performance if the HD audio was off by default ;)

This made no difference for me, using a Audigy 4.