[ksec]

But LuaJIT 2 is insanely fast, even the Heavy / Fast Ruby isn't even anywhere near its speed. So why would one choose mRuby over Lua?

[Cloven]

Heavy Ruby is not designed for speed, and much of its heaviness causes slowness. It's entirely possible/likely that mruby will be in the same ballpark as luajit2 soon after release.

[heretohelp]

LuaJIT 2 is fast because the Lua world has Mike, who is a genius.

That said, Lua is fucking weird.