Getting done right does not mean getting done slow. Getting done right means getting done fast. You will go faster if you do things right. You will go faster if you come down off the “high” generated by the illusion that effort is speed. You will go faster if you calm down, follow your disciplines, and refuse to rush.~ Bob Martin from, http://blog.8thlight.com/uncle-bob/2013/03/11/TheFrenziedPanicOfRushing.html
While he’s talking about software development in general, and test-driven development specifically, this is true for – I think – everything. My experience is that this is true for software development, and other technical work. But it is also true of martial arts practice, parkour, games, building model airplanes… you name it.
The pervasive admonishment should be “do it well,” rather than, “slow down.” Do it well and you’ve – by definition – done it as fast as possible. What’s the point of doing it poorly? What’s the point of rushing to completion; If you didn’t do it well, then it’s not done.