Why is datawindow retrieval in Window so much slower than Datawindow painter?

I am using PB 12.5.

The problem is my datawindow that uses a stored procedure as a data source runs in 2-3 seconds in the Datawindow painter.  However, when the window runs the data retrieval takes 12-15 seconds.  The database I am using is SQLserver 2008.

Any suggestions as to why there is such a large difference between the retrieval in the Datawindow painter vs. the Window?

Thanks