I have noticed that there is a half second or so delay between when you touch the .navbar-toggle and when the dropdown menu flies out. This short delay might relate to how mobile browsers detect a click(). It seems that binding touchstart() to .navbar-toggle does the trick.
$(document).ready(function(){
$('.navbar-toggle').bind( "touchstart", function(e){
e.preventDefault();
$('.navbar-collapse').collapse('toggle');
});
});
It’s important to note that touchstart() will interfere with mobile scrolling, so if your “hamburger” or .navbar-toggle target is larger than default it might be better to avoid this patch.
