http://superuser.com/questions/16893/do-usb-or-ps-2-keyboards-respond-faster http://superuser.com/questions/16893/do-usb-or-ps-2-keyboard... PS/2 keyboards obs

http://superuser.com/questions/16893/do-usb-or-ps-2-keyboards-respond-faster http://superuser.com/questions/16893/do-usb-or-ps-2-keyboard... PS/2 keyboards observationally are known to have a bit less latency. Since there are a ton of variables at play (keyboard controller, USB poll rate, PS/2 interrupt queuing, etc.) it's hard to evaluate just how much the difference will be with any given setup.