Game signature highlights stuttering?

As I said before, its a problem with USB keyboards... That's it, no other solution...

My keyboard (FILCO Majestouch) is USB native..I used to use USB interface w/o any stuttering problem.

I believe, that it has a problem on just some of the usb keyboards, I have logitech one...

I have a logitech USB keyboard as well, unplugging it does nothing for me.