Now, that is a very relevant detail!

I did not know LuaJIT was even a thing.

Still probably not as performant as ... C++ or Rust or something, that is totally precompiled... but that would explain how this is even possible, a 3D Lua based physics engine.

Yeah, looks like LuaJIT passes a bunch of the Lua code into C, just good ole C, and then dynamically compiles it, then runs the 'translated' C code.

That makes a lot more sense lol.