IE script unresponsiveness alert in DualListField

[nanich]

I have a DualListField rendered in one of my pages and I need to load 1000+ items into each listField. Since GXT does lot of iterations while selecting/loading the items, I constantly get IE unresponsiveness alert.
To solve this above issue, I tried to add items in chunks of 50 by using GWTs DeferredCommand. This solution too is not successful enough to solve the IE alert...

Here is my code

public class MyDualListField
    extends LayoutContainer {

  private DualListField<ModelData> dualList;

  @Override
  protected void onRender(Element parent, int pos) {
    super.onRender(parent, pos);

    dualList = new DualListField<ModelData>();
    dualList.setFieldLabel("My Label");
    List<ModelData> models = new ArrayList<ModelData>();
    for (int i = 0; i < 1000; i++) {
      BaseModelData modelData = new BaseModelData();
      modelData.set("id", "id" + i);
      modelData.set("name", "name" + i);
      models.add(modelData);
    }
    ListField<ModelData> from = dualList.getFromList();
    ListStore<ModelData> fromStore = new ListStore<ModelData>();
    from.setDisplayField("name");
    from.setStore(fromStore);
    from.getStore().add(models);

    ListField<ModelData> to = dualList.getToList();
    ListStore<ModelData> toStore = new ListStore<ModelData>();
    to.setDisplayField("name");
    to.setStore(toStore);
    to.getStore().add(models);

    add(dualList);
  }
}

Any inputs ??

[nanich]

FYI, the initial rendering happens with out any issues. But the (selecting / moving from one list to another) more than 500 items creates the unresponsiveness. Can anybody help me on this ?