Please make sure that UI virtualization
is enabled and that you're following all the best practices
for optimal performance. Most importantly, you should ensure that RadGridView is not placed in controls/panels which will measure it with infinity. For example, ScrollViewer, StackPanel
and Grid with Row.Height=Auto or Column.Width=Auto will measure with infinity. When the control is measured with infinity the virtualization turns off.
Please let me know whether you find the provided information helpful.
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