I got aswell the 1 fps issue. All the texture goes to sh*t ingame. In 3rd person view, my body dissipear time to time and goes through the ground. Even in editor same issue. Meanwhile on stratis i get 120+ fps in editor. I've got -nologs and -nosplash in my launch option.
My rig
I7 950 @ 3.8Ghz
GTX 580
4Gb DDR3
250Gb SSD
Windows 7 32 bit