That's kind of a digression, but the Lua GC is pretty simple (which is good) and not so efficient. The LuaJIT GC has some interesting features but sadly Mike Pa

That's kind of a digression, but the Lua GC is pretty simple (which is good) and not so efficient. The LuaJIT GC has some interesting features but sadly Mike Pall did not complete all of his plans for it. What makes LuaJIT so efficient regarding the GC is that you can allocate memory that is not managed by it (using the FFI). You have to if you need to use a lot of memory anyway, since depending on the architecture GCd memory can be limited to as little as 1 GB.