I am happy to announce that we think we found the problem that was causing serious delays in response times. With the updated software, IPB inserted some java code in some areas that caused the number of database tables to be queried unnecessarily. We were able to final pinpoint the issue when we saw a call to "deliver.avsim.net". There is no such function. Removal of that has restored our system to a reasonable response time, even with (as I write this) over 800 users online. I hope you find the performance now much improved.