It is a beta but jesus christ, this version was assembled september 5th so its not like its months out of date. Thers a guy on hardforum with sli gtx's and a 4ghz dual core getting around 15 or so fps in some areas.
Doesn't make much sense, ive noticed though that vista isn't supported in the beta..which is retarded seeing as the full game supprots it. Dunno if the OS has anything to do with the amazingly shitty performance.
http://img514.imageshack.us/my.php?image=cry1tg6.jpg
screen i grabbed when playing, the demo has settings for upto HIGH but ultra high is disabled so that must be the setting where the zomg look at that screens were coming from.