If you can't handle playing a game that is in beta I suggest you see yourself to the door and wait until the game is finished. They are working on it, fixing things takes time. If you want to help expedite the process, feel free to submit a bug report here: http://pa.lennardf1989.com/Tracker/index.php?project=1&do=index Don't expect something to get fixed if they don't know about it. Edit: Also, the problem could be related to your hardware/drivers and not the game, try uploading your dxdiag.
You know since it is Beta it just might benefit development, as well as others who encounter the same issues, if you provided the necessary information so both the Developers and Community can log the issues and help figure out a fix for the problems.