I am experiencing another big slowdown in .NET. This time it is in regards to the Xsl transformation I am applying to the export to Excel.

Last week, we exchanged some threads in regards to the ability for a .NET application to export its dataset to Excel in a native spreadsheet. My ExportToExcel() method is using the following to apply the Xsl transformation:

            loXslCompiledTransform.Transform(loXmlDataDoc, Nothing, loStringWriter)

Well, during our tests, we had only two records. Today, I am trying to apply that against the data, where I have 826 rows in the dataset. We guess what! As it takes about 0.5 second per row, I am ending up with a browser timeout as it would take several minute for this Xls transformation process to complete. This makes this approach unnacceptable.

Anyone could explain this behavior as to know why it takes so long for the Xls transformation to execute?