Seeing some answers, I see that maybe I was not clear, I repeat:
1) with 101 and 102 I had EXCELLENT performance
2) with 105 I have crappy performance
I add that I tried any kind of driver (ngohq, betas, abit), any kind of optimization (defrag, kill services, increase virtual mem, kill themes, suppress eax and so on): nothing to do, i must lower significantly the settings.
Now, if from 102 to 105 there is a SIGNIFICANT performance decrease (and lots of people cant even play after 105), that is not my fault, is bis fault.
Regards
p.s. I will use bug tracker of course