I was reading Marvin Minsky's The Society of Mind:
This (practice makes perfect) is really is quite curious. You might expect, instead, that the more you learned, the slower you would get-from having more knowledge from which to choose! How does practice speed things up?
Another related observation is that more practice also make things less effortful, to the extent that people can "autopilot" after practicing for long enough, like driving. But what makes this shift from consciousness to unconsciousness possible? What happens in the process?