Actually, a job interview is one setting where a lot of people would benefit from deliberately slowing down. I've read that the rule of thumb is that you should speak about 20% slower than feels natural. The idea is that most people suffering from nerves at an interview (or presentation, or speaking engagement etc) will tend to talk way too fast without even realizing it.
There is something to be said for being patient, mindful and methodical in your actions. This can actually help you to be more productive. It allows you the time to see circumstances developing around you, to plan your next move and to make adjustments for things you wouldn't necessarily have noticed or may have forgotten if you're too rushed. You spend less time fixing things you missed in your haste. Slow is smooth, smooth is fast and all that. This is essential in high risk activities. You still move with a purpose, just not in the mad, half panicked rush people seem to slip into when they're in a hurry or they think they're "multi-tasking".
I would sooner have a co-worker who took his time, paid attention thought things through and then took intelligent action than one who was forever charging ahead trying to git 'r done. Actually my right thumb is about half an inch shorter than it was thanks to the excessive initiative of one former coworker.
That said, what SM is describing or at least the way in which he describes it sounds like something different.