Data set/Module runs very slow

[jcbadger]

I created a data set then module with a few filters to run a report off of (3MB, 12 rows/600000 rows). I then created a simple crosstab with this data and when I run the report it takes up to 5 minutes filtered on one year, and 10+ minutes filtered on multiple years of data. Why is this?? Shouldn't a data set run much faster then coming from a package? Help!!