I’ve just got hold of a 1949 copy of a Simplified dictionary, and was interested to read what it says about speed:
‘The fastest shorthand outline (within reasonable limits) is the outline that requires least mental effort, the outline that is written consistently and analogically. The speed of a shorthand outline is not to be judged by its brevity to the eye, nor even by its facility for the hand; it is to be judged by the speed with which it may be constructed by the mind and supplied by the mind to the hand.’
I hadn’t really thought of it like that before. I suppose it’s a bit like sight-reading: when you’re really good, you don’t hesitate.