okay here's a ?
how come only some of the villagers walk REALLY fast like the children...
i need more fast walkers to be foragers and builders...
how do i make my villagers faster?

Those villagers are special, and you don't get many of them. If you check the Details screen for the fast villagers, you'll find that they like running.

I've got one that is so slow that everyone will be back working when she finally gets to the place that they were celebrating

I was praying for a fast villager who likes running... instead I got "Sauntering Sam" who DISLIKES running. In a race between SS and molasses, molasses would win. I dunno whether to cry or laugh :P

One plus for Sauntering Sam - he should be an easy mark for any of my designing women... he shouldn't run too far, and certainly not too fast, ya figure? lol