Lag in drag with easing interaction on iPad/iBooks Author

Question

Hi folks,
I'm doing a drag and drop section in a children's iBooks project that I'm working on and I need it to have some easing.
It works great when I preview it in a browser on my mac, but as soon as I've put it onto iBooks on the iPad it's a bit poor in performance. It does do the easing, but it's a bit jerky at times, this is just about OK, but what isn't OK is that there is a noticable lag (about half a second) between clicking on the 'draggable' <div> and it responding.
I know from reading that this is meant to be down to the need for the iPad to be able to detect if this is going to be a swipe or some other interaction othan just a 'click'.
I had also read that the 'touch-punch' jQuery plugin would sort that lag out.
I have opened the package contents and manually dragged over the relevant libraries for the 'touch-punch' plugin, but it's not working.
Any ideas?
The code I'm using in the composition ready section of the stage is as follows:
yepnope(
    nope:[
        'js/jquery-ui-1.9.2.custom.min.js',
        'js/jquery.ui.touch-punch.min.js',
        'css/jquery-ui-1.9.2.custom.min.css'
    complete: init
function init() {
    sym.$('draggable').draggable({
        helper: function(){
            // Create an invisible div as the helper. It will move and
            // follow the cursor as usual.
            return $('<div></div>').css('opacity',0);
        drag: function(event, ui){
            // During dragging, animate the original object to
            // follow the invisible helper with custom easing.
            var p = ui.helper.position();
            $(this).stop().animate({
                top: p.top,
                left: p.left
            },1000,'easeOutCirc');
If anyone had any thoughts or tips that woudl be great.
Thanks,
Tom

Answer 1

Just incase anyoe is wanting a solution to this I found another jQuery plugin called PEP which is VERY responsive and works really well for drag and drop on either tablet or desktop.
http://pep.briangonzalez.org/
I'm still curious if anyone has any ideas on why the touch-punch doesn't work though. Anyone?