GridView: The scrolling becomes very slow when setting the left and right frozen columns to 0 and resizing the columns so that their summary width is smaller than the data grid's width
The vertical scrolling seems to become very slow and even unresponsive, when the following conditions are met:
left and right frozen columns count is 0
the summary width of all columns is smaller than the width of the RadGridView element
To minimize the issue, you can set the GroupRenderMode property of RadGridView to Nested.