I have a new Vaio notebook in my hands, with the same configuration as the first, which I posted above; fast ssd, win8 and similar chipset (HM76) inside the pc for usb3.
With the pendrive previously tested I reached the usb2 cap, near 33 MB/s.
I'll try to proceed.
The solution ekko gave us is really good, as far as Microsoft doesn't release a better solution.
I sincerely don't understand how these two big companies couldn't be worried about it, such a good os with a wounded paw