The game is UNPLAYABLE at 30FPS. You should have made this out in the open as this is simply unacceptable for PC gaming.

I purchased the game through steam, please advise me how I can get a refund because it hurts my eyes to play the game like this.

Or maybe at least give us an OPTION to try it ourselves first? I'm not an Nvidia user so why should I have to suffer this crap?