i remember this from reading some articles about performance in unity from internet which awaring javascript users from using it in unity about really massive issues of using javascript in unity instead of C#, it says that C# is almost 4x faster than javascript!
i really appreciate that article b/c it saved my ass when i was about to start gaming, i dont mean that javascript it bad for unity developers , it is good but my advice could be that if you like using javascript, you should use it for simple small gamesNOT FOR BIG PROJECTS because it really can be a damn problem!