Can you post your 'stat perfdump' results with the current settings you have for the game?
What resolution are you running the game at?
Do you have one frame thread lag turned on or off? If off, turn it on and see what kind of performance difference you get.
Can you delete your config/ini files from My Games\RedOrchestra2\ROGame\Config folder, launch the game with the default settings and see if you notice any performance difference?
What settings have you forced through the drivers?
Although not required, it'd be a great help if you could post a video that shows the stuttering you're seeing? We keep hearing about this a lot, but it'd be good to know how bad this actually is.
Also, thanks Das_Bose for helping out with this thread!
EDIT: Please put a constructive title for your thread if you expect to receive support.