Since today I got a huge fps improvment, from 40 fps with shadow disabled to 70 fps all "high" including shadow
I don't know what they did, but it's amazing for me
p.s.
CPU Intel Core i7-2720QM 2.20 GHz (QC, 6MB, 45W, T3.30GHz)
RAM 16 GB DDR III 1.333MHz (4x4.096MB)
HARD DISK SSD 80 GB Intel 320 Series (G3, 25nm)
VGA AMD Radeon HD 6970M 2,0GB GDDR5 dedicati
Driver 12.1 beta