Touch processing adds somewhere in the ballpark of 15-45ms of latency depending on the technology used in the screen and the quality of filtering in the touch c

Touch processing adds somewhere in the ballpark of 15-45ms of latency depending on the technology used in the screen and the quality of filtering in the touch controller. Anything about ~20ms of latency (total from touch to display) is perceivable by humans, is usually a good approximation for noticable increases or decreases in latency (i.e. shaving off 2ms doesn't really matter, but shaving off 15-20 will be noticeable).