In case any of you find this problems. Here is the infor I have. After upgarding to BO 6.5 we were having performance problems and some of the things we found in our investigation: 1) There is know bug for BO 6.5 were the client is sending a lot of uneccesary messages to the server; this was known for unix, so we found it for windows. BO is working on a hot fix for this.
2) BO was not closing the session in the database, even hours after the client was disconnected. BO is working on this as well