Would it be faster than javascript? if so, how faster? Is it worth the change?
About the performance, I have no clue, about if it is worth the change, I'd say it depends if you're willing to trade the cross-platform ability of js/HTML5 to a "work only in chrome" environment and if it brings you any benefit.
As far as C2 is concerned, I believe Ashley will stick to JS/HTML5 no matter what until the HTML5 exporter is considered finished.
He has spent already so much time, a switch now to a lesser spread platform would make few sense.