I have a radtreeview and I have it's IsLoadOnDemandEnabled property set to true. I fill in the first level of nodes and then expanding every node fetches more data.

I also have filtering logic where the top level nodes are filtered by the text entered by the user.

I am experiencing long delays when I bind an ObservableCollection<T> to the tree. It is particularly annoying when the user deletes everything from the filter textbox and it takes a second or two to bind the filtered data to the  tree again.

I have checked that the time it takes to filter the collection is insignificant compared to the delay I am talking about.

Hi Rupendra,

Have you set RadTreeView's IsVirtualizing property to True? If not, give it a try and let me know if it makes a difference. If it doesn't help, could you please send us a sample project reproducing the issue. This way we will be better able to assist you.

Kind regards,
Kiril Stanoev
the Telerik team