I usually don't have any problem with the speed of my reports, but this particular one is giving me a problem. It is a basic grouping report that sums the data. There is a parameter for the dates. I run it weekly and don't have a problem as long as the week is within one month. But when I run it for the last week of the month and the months overlap (i.e. May 28th - June 3rd) the report takes about an hour. Any other time it takes a second to run. The other problem is that when I run this report it slows our database down to a stand still. Obviously making my end users very upset. Any suggestions or trouble shooting points?