Hi Rob and thanks for the reply. The query in SSMS only takes 15-20 seconds to return the data even if I select all values although I had someone tell me that 15 seconds was too long for a query execution. My feel and the results I posted seem to indicate that SSRS begins to struggle as more columns are added dynamically based on the query results. So I guess I'm really looking for some feedback as to what volume of data is reasonable for SSRS to process in a matrix style report so I can determine whether I should look for an alternative solution.