Mote.js is a spec-compliant, fast implementation of mustache templates.
For more information, check out the mote site.
Via Node, it's as you'd expect:
npm install mote
I got it working, then set about trying to make it fast. I didn't think I could be competitive with the existing libraries, but I tried anyway. After all, this was just supposed to be a toy.
Much to my surprise, it ended up being really fast.