Wow. The backend, emscripten (http://code.google.com/p/emscripten/wiki/GettingStarted), seems really nice. Wonder how it will work out with Rubinius....
Edit: Guess i just found it out :( http://code.google.com/p/emscripten/issues/detail?id=1
Edit: Guess i just found it out :( http://code.google.com/p/emscripten/issues/detail?id=1
But it will be hard to do without help from someone that knows Rubinius well (I don't).
Lua code compiled to LLVM bytecode then to Javascript using Emscripten will most probably be faster than code interpreted on the fly in the browser, but I wonder by how much.