Hi, in my app I continuously create and destroy field items. However the Heap is getting bigger and bigger and the app gets laggy.

I have attached listeners for deactivate and destroy all child items:
Ext.getCmp('card1').on('deactivate', function(oldCard) { Ext.getCmp('card1').removeAll(true); });
Ext.getCmp('card2').on('deactivate', function(oldCard) { Ext.getCmp('card2').removeAll(true); });
Is there something more to do? If the items have handlers attached, do they destroy too?