The RadTreeView control is designed to visualize large amount of hierarchical data and it exposes mechanisms which can boost the performance of the control if needed. One of these mechanisms is the UI virtualization.
By using this mechanism you will force the control to create the UI containers only for the items that can be visualized in the current viewport of the control. You can find more information about this feature here
Please try the UI virtualization out and let us know your feedback.
Pavel R. Pavlov
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