[Derbasti]

This is a terrific writeup about the latencies of text editors. Now the next step is to research the effects of latency on cognitive strain, typing accuracy, and typing speed.

Without that, the latency numbers themselves don't mean much. Some 100 ms latencies are readily noticeable (video game input), others are not (pushbutton responses).

This paper (http://www.tandfonline.com/doi/abs/10.1080/00140137608931531) seems to suggest that typing speed does decrease at higher delays, but recovers after a short time. I can't access this journal though, so I don't know what kinds of delays were tried, and I don't know how long the recovery time actually is.