put them on a tab / popover, regular users can't go to that tab / popover, managers can.
Thanks for your reply.
I finally got around to testing your advice.
I created a tab control and put all the summary fields on a tab other than the default tab. When I open the layout the summary fields don't recalculate until I click on the tab that they're in.
Now all I have to do is convince the big boys to let me put their stuff on a tab.
It's going to take some redesign of the layout as not all the summary fields were in the same place. They were all spread out to the right of the window border where they normally wouldn't show.
Maybe a popover is a better idea. I can put a button in the middle of the layout so the managers don't have to scroll around. Then they can change the found set and the summaries wouldn't calculate until they click on the popover button.