Please go and try out a few searches with various options and let us know any that take a very long time or never complete.
If you find the search running for several minutes or longer, seeming never to finish, that means you have run in to the old bug. You will then need to clear your cookies and log in again as your account will seem locked out otherwise.
A bug in the Postgresql query planner was causing more complex search queries to get stuck in the planner phase for hours. Since the database upgrade it looks like they've fixed those bugs.
Complex searches should now return within a few seconds. Some we have noted can take 20 - 30 seconds which is still not ideal, but at least they complete. We'll keep working on making those much faster.