When using the Remote System Diagnostic Extension, published by ScreenConnect labs, under both 6.0 and 6.1, we were experiencing significant performance issues. The main panel would take 30-90 seconds to fill in, and session information was similarly delayed. This problem progressively got worse over a period of time. Resources on the box were not an issue.
We are also running on MSSQL, so support essentially washed their hands and blamed the flavor of SQL as the reason for the problem without doing any more troubleshooting than saying the circle was spinning so the issue was SQL.
After disabling the extension and purging all entries in SessionConnectionEvent where EventType=83 (p.s. the documentation on the support site still does not define this event, but it looked like diagnostic data when I reviewed the DB), performance returned to normal. In our case, we purged ~600,000 entries of this event type.
Customer support service by UserEcho