Funny how this exactly applies to instrument playing. Unearned speed only begets sloppiness. The only way to go past a certain velocity is to do meticulous metronome work from a perfectly manageable pace and build up with intention and synchrony. And even then it is not a linear increase, you will need to slow back down to integrate every now and then. (Stetina's "Speed Mechanics for Lead Guitar"; 8 bpm up, 4 bpm down)

I think Demming never put this between his famous phrases, but if Lean carries any lesson is that high-quality work tends to be faster than fast work.

I like to break a big task into small tasks, then do each small task fast. I don't worry about how long the big task takes. I'll get there in the end.