Iscroll is very slow on android 4.1 device

Question

I am Developing A phone gap application here i am using iscroll4 to scroll the fixed list item It's working fine in all other device but creating problem on "Android 4.1 Version device" the Scrolling is very slow. Please can You give me any solution for that its sroll fine on Android 4.1 device.

My Cade is Like This..

  var myScroll = new iScroll('headerWrapper',{
            snap: 'li',
            hScrollbar: false,
            vScrollbar: false ,
            momentum: true,
            vScroll: false,
            onScrollMove : function(e){
 if(deviceType() == 'android'){
                    var deviceVersion = device.version;

                    console.log(" deviceType is ===>>"+deviceVersion);
                    if(deviceVersion=='4.1' || deviceVersion=='4.1.1'|| deviceVersion=='4.1.2'){
                        console.log("android version is ===>>"+deviceVersion);
                     setTimeout(function(){
                        myScroll.refresh(); }, 1000);
                    }
                }
               // setTimeout(function(){myScroll.refresh();},0);
                }
    });