Thank you for contacting us.
We aware of a performance issue when using a large number of rows in self-reference mode. I added this as a public issue
in our issue tracking system. This way you will be able to track the issue status. We will work in future to improve RadGridView
behavior in this scenario. Currently, this task is not scheduled and I cannot give you a time frame when it will be addressed. I updated your Telerik points accordingly.
Should you have other questions, do not hesitate to ask.
the Telerik team