Is it your mysql server? try resetting it. If its a hosts, contact them.
I have the same problem. 50% of the time, it takes over a minute for the page to load, but it always loads. The rest of the time it loads instantly.
My web host says the server is fine (which I believe as we don't have problems with other web apps using the same database server).
I've also searched the forums here for 'slow' and found quite a few hits with people reporting similar delays of over a minute when clicking on links (all appear to be within the SCP as far as I can tell).
I've turned SQL error reporting off in the preferences to stop getting spammed by these errors, but I wonder how many other users experiencing delays on page loading would also see this same SQL server error if they turned SQL Error reporting on?
The more I think about this, the more I believe it is an OSTicket problem that is only exhibited under certain circumstances.