As someone else mentioned, I think you might need to spend a little more
time collecting the right data and then start fixing your problems by
priority. I am guessing that all of your users are complaining about
performance at this point.
Something that I have noticed in the past when working on Oracle apps
installations is that poorly custom coded reports, jobs, and forms can
really tear away at the performance as they slowly get introduced. You
should be able to find out which jobs are the most critical and taking the
longest to run within apps. Start tracing those jobs as they run and
working on improving their performance. In other words, improving the
puzzle piece by piece can often improve the whole.
Also, watch out for forms that allow the users to run selects without
providing fields to select by. These can easily chew up a lot of resources.
Anyways, Im sure people on here will be able to give you better advice
Good luck : )
....much of the problem lies in custom scripting not in a particular module..