"You have the reaction of a 23 year old". Since I'm 45, I guess I should take that well, but I would guess it has more to do with spending my 45 (one way) mile daily commute watching for animals on the road.
Or simply having a fast computer. If you make the window smaller the graphics speed up and your reaction times magically shrink.
The Macbook I took it on is by no means fast. I do take the point about judging hand-eye by methods with such a potential for variance. I do wonder how one overcomes that on the web?