We use this term in the military all the time. We do timed exams on weapons disassembly, recitations of regulations, complex manual tasks, etc. The phrase "slow is smooth, smooth is fast" is very true in almost anything. You can hurry through something and likely do it wrong or you can be methodical and do it right the first time. This is especially important when you only get one try to do something right - ie a complex turn or set of maneuvers at speeds that mean maiming or death for failure.
Any idiot can rip the throttle and lay the bike down like a moron... or pull a wheelie... but the guy that does everything right - every time - with no sense of urgency or rushing, will be the guy that does it correctly under pressure because he's mentally trained himself (herself) to do it right every time.
I've seen guys tear apart an MK19 grenade machine gun to base components in well under a minute but they can't do it that fast every time. The guy that does it 1000 times correctly but takes 2 minutes each time will normally beat out the speed maniac in a timed trial.
This is why SWAT teams to magazine drills over and over and over, why martial artists practice strikes thousands of times, why sprinters practice snaps, why pro riders take the same turns over and over again.... because practice makes perfect and you don't start practicing at 'combat' speed.