Guile is the one I would embed, but it's speed is not yet on par with LuaJIT (and probably never will be, since LuaJIT is in a class of it's own). Guile3 will probably be one of the faster schemes since they are implementing native compilation, but that is still some years away.

It is nice to embed though, and is a lot faster than python for things that isn't only using python things that are implemented in c.