Hi Sriram,
Please confirm if you are using the Ajax suit of our controls or not.
If you have a great number of nodes and you are clearing them using javascript clear() method, this might cause a certain delay as you have observed.
There are some methods to improve the performance of the Treeview, but my suggestion is to use LoadOnDemand with WebService as shown in this demo
here. If this doesn't work in your case, please provide us with more information, on what exactly is your scenario and approximately how many nodes, do you have in the treeview.
Kind regards,
Dimitar Terziev
the Telerik team
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