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Very slow UltraGrid

I have an UltraGrid, with about 40 columns and 10000 rows.  Most columns are strings, but a couple are DateTimes or objects.  The UltraGrid datasource is bound to a DataSet with only one table.  Only the visiblerows are being updated with data, with the data being updated on a row by row basis fairly often.  Somehow, the grid is ultra, ultra slow, and at higher resolutions it takes a long time to scroll up and down, and left and right too.  I am wondering why this is?  I notice Infragistics WinForms are still on .net 2.0 - .net 3.5 supposedly sped up DataSets heavily.  Do you have any other ideas for why this is so slow?  It is a serious problem.