I think part of the point of the parable is that speed does not matter as there is no 'goal'. We all are just wandering about aimlessly enjoying the wind and sunshine. Sure, some move faster, but just to the other side of the big lake to have to scoot around. Some don't move at all and work on their tans. If you like the wind in your hair, find/make a fast boat.

(I think the parable starts to break down though. How to describe nations, laws, gender issues, etc? It's too much for such a 'happy' story to go into any depth.)