This thread on the Red Orchestra forums. At first, the mod ran crappy for me with frequent crashes and overheats (even after only being in game for like two minutes) and I was let down that I downloaded a 1.4 GB piece of shit.
A few days after first trying it, I decided to give it another shot and cleaned all the dust out of my PC, update all my drivers, and did other maintenance to my computer. Ended up working fine and I am glad I decided my PC was at fault and not the game, or else I wouldn't be playing it now.