I checked Config.ini file in Core directory. CPURating, SystemRAM, VideoRAM was set to 0. I changed it according to Config.ini in UserData directory and my real HW specs and got better fps. Not perfect but almost smooth now with 20 cars on track.
I'm gonna play with some other numbers and will...
I realize most of my games are old. That is why I mentioned F2012 as well which is new and so good looking and runs smoothly. I can not see anything special about rF2 graphic, so why it can not run smoothly? As I mentioned I have to lower graphic setting even on single screen. I just thing that...
I run GTR 2, GTL, Race 07 & Addons, ARCA, rF1, netKar Pro, F1 2012. All with high setting. All on 3 screens without any FPS problem or drop. It's obvious that my GPU HD 6970 OC/2GB CAN handle 3 screens. So it is not my PC what is wrong.
Multiview makes no difference even in appearence for me. In Arca for example I can see difference in appearance but in rF 2 NO dofference. That makes me surprised.
Poor performance on triple screen here as well! HDR off, FXAA off, one car on track - 40FPS!
Multiview option does nothing - same look, same performance.
Even on single screen I am getting less than 60 fps which not really good. (it is not my PC, other sims run perfectly)
Waste of money...:(...
I changed Config.ini - CPU Rating=2, ShaderLevel=3. I received usual 60 FPS when I was driving alone. With more cars on track it FPS goes down again (40fps). Switching multiview on/off makes nothing.