Adding a group makes the report take forever to generate

I made a report using AR_Customer/AR_InvoiceHistory/AR_InvoiceHistoryHeader to find out the sales from a certain vendor and a UDF commission sales rep. It takes 30min to generate a months of data. If the report has already been generated I can add a Group for the UDF CommSalesRep and its almost instant. But if I close the Preview and add the group and try to preview it again it takes forever, and what I mean is never. Is there something special you need to do when adding a group?

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