Thank you for writing.
I created a sample application in which based on the provided information about your scenario I tested how RadTreeView
performed with loading data on demand. I did not observe any issues, actually compared to our previous release the performance has improved significantly.
My tests handle loading of 100 000 items when a node is about to be expanded. For reference, I am sending you attached my sample project as well as a gif file showing how the tree behaved on my end. In order to further investigate what might be causing the reported delay in your application, I am going to need your project. This way could debug it and get an understanding of your local setup.
Since file attachments other than images are not allowed in forum posts, you can send me the project in the support ticket you have also opened regarding this same topic.
Looking forward to hearing from you.
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