As it is much easier and we have very little data to migrate from 3.5 to
3.51, I chose to do a fresh install of 3.51 User Application, and then
import my one (1) PRD. The PRD includes a number of "onLoad" queries to
populate some pick lists, but all relevant attributes are indexed in
eDirectory, and the 3.5 version of the PRD runs fine.

The form load now takes about 1 to 2 minutes, where it used to take maybe 6
seconds. It is interrupted 3 times during the load with an IE message
saying "Stop running this script? A script on this page is causing Internet
Explorer to run slowly. ... etc."

After acknowledging each of the three messages, one of my 3 pick list

So...Is this an expected result of migrating a PRD created in 3.5 to 3.51?
Is it a bug? Any recommendations on where I might look to improve
performance of this form, and/or the queries running on them?

Thanks in advance,