I'm gunna be picky but that's not actually the links between your optic nerve, brain and your fingers improving

The actual speed that your brain can perceive the difference images being sent by the eye
is more or less limited to around 30 FPS... what's improving with practice there is your reaction time; the speed at which the muscles in your hand are flexing the tendons that control your fingers. You are blindingly quick, yes. You will be a ton better, physiologically, at that than somebody who's only played for a matter of weeks or months, yes - but it's only your reaction time changing - and
that is throttled by the fact your brain can't perceive differences in images closer than around 25-30 miliseconds apart.
It just can't; the body's nervous system is like a computer, it operates on electrical impulses. There's a limit to the speed at which the body can charge and discharge the cells in nerve tissue. To us it's virtually instantanious in most circumstances, but it can't be improved beyond normal functioning even with practice.
It's like copper wires being able to handle so much bandwidth - the only way to increase bandwidth, ultimately, comes from upgrading the network from copper to optical cable.