3D rendering aside, what about 3D physics? Apparently cannon.js is a 3D physics JS library written from scratch.
Follow the white rabbit, uh, link for examples. I don't see much use for the library without some sort of 3D renderer, but there it is.
3D physics engines are even more CPU intensive than 2D physics engines, so I think we'd be best sticking with Box2D until we add 3D features, which we have no current plans for.
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Yeah, I was thinking that as well. Just wanted to throw it out, as a bone to chew on.
Demos didn't seem particularly CPU intensive.