"What is zen speed," you ask?
"Is it fast or slow?"
Well, I like to think of zen speed as the speed you travel on the path of least resistance.
In a way it feels fast because there's no resistance or friction. In a way it feels slow, because there's no rush, no forcing, no pressure.
You are just traveling at whatever speed the current of life is flowing...maybe it's a rushing river, a waterfall, or a slow moving creek.
Some say that zen speed is not a speed at all. It actually transcends time because you are so in the moment you are hardly aware of time passing.
Either way, it feels peaceful because instead of struggling to go faster or slower or in a different direction, you are letting yourself be carried by the current.