Here is what I learned today.
I have a query using the OrderLines Table (which is owned by Orders) with a column with a presentation rule. My presentation rule WAS:
OrderLines.ob_Orders.deadline IS DEFINED
and the query ran SLOW. With 8 seconds between pages. Vlad told me that this is more costly than using a shortcut.
I changed it to
OrderLines.sc_Deadline IS DEFINED and it went to 2 seconds between paging!
Silly me, I assumed that they were identical. (Of course, now I have to go through my application and find where I thought I was smarter than Aware!
Bruce