[AC-2171] Titanium picker scrolling lags for the first time

Whenever I scroll the picker, for the first time there seems to be a small lag in scrolling. That is, when user scrolls the picker, there is a lag for few seconds and then users are allowed to scroll records continuously. This lags happens only for the first time. First I thought it was a issue with by code, so I posted an issue here in [Q&A](https://developer.appcelerator.com/question/161965/titanium-picker-scrolling-lags-for-the-first-time) But later I tried with default options like below and still the same. Seems like {color:red}by default there is a time lag with titanium UI picker{color}

var picker = Ti.UI.createPicker({
  top:50
});
  
var data = [];
for (var i = 0; i < 500; i++)
{
  data[i]=Ti.UI.createPickerRow({title:'Bananas' + i});
}

picker.add(data);
picker.selectionIndicator = true;

win = Ti.UI.createWindow ({backgroundColor : 'black'});  
win.add(picker);
win.open();

Hope this can be easily reproduced by others.