c# - How to reduce the time delay for loading the large datasource in the CheckedListBox? -

when set datasource of checkedlistbox 10lack items. applecation remains ideal upto 3 minutes.

//load 10 lack items foreach (var item in source ienumerable<object>) {     this.checklistbox.items.add(item, true);         } 

is there way optimize time delay loading items in th checked list box.