That click event should have been the default jQuery Mobile click event, which is very slow in environments like iOS.
You can transition back again using the button below, or try the fast example page again below to compare.
Click the button below to go to the example page that does implement jquery.mobile.fastButtons.
This html file is using the default slow click event from jQuery Mobile.
Try transitioning to another page using a button that has not been modified by jquery.mobile.fastButtons.
Click the button below to go to the example page that does implement jquery.mobile.fastButtons.