The other thing to consider is how is latency perceived when actually TYPING in real life. My guess is that the difference between the shortest latency and the

The other thing to consider is how is latency perceived when actually TYPING in real life. My guess is that the difference between the shortest latency and the longest latency hardly matters for the purpose of a human putting words on a screen. There's so many other cognitive activities going on that I can't imagine someone would notice unless they're specifically looking for it and nothing else. Really, does anyone complain about this stuff? even world-class touch typists? Of course there is some threshold of latency when it starts to become noticeable/disconcerting for some fraction of people and probably quite a lot more when half of all typists start to notice. Anyone can definitely feel this on terminals connected to very remote machines. This is an interesting topic and am glad that Mr Luu is looking into it. The measurements described are absolutely a valuable first step towards understanding what latency really means for human factors in typing (first, what is the f-ing latency). I expect the folks at Logitech and other places have significant proprietary research on this stuff, but maybe not?