What I REALLY want to know is... can it run "flow" (https://github.com/facebook/flow). Because it's very useful yet painful to install... And I don't even know if it works on Windows.
I will try to profile it soon but basically, until now, it was more about "what's possible" than "how fast can I make it" kind of project. Also, that exception-handling either is a great idea, thank you.