When ColumnSizer is Auto, AutoLastColumnFill, SizeToCell and AutoWidthLastColumnFill, column widths are calculated based on all the records. In DataVirtualization case, accessing all the records will take some time for calculating the column widths. You can optimize the column width calculation based on initial display records by customizing GridColumnSizer. DataGrid.View.Records.SuspendUpdates() suspends new records creation, so column width calculated based on only available records.
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