I have a single IPCC express server here (4.0(5)_Build042), connected to a CallManager 4.2(3)sr1 cluster.
Everything looks fine and works, but the application administration pages are extremely slow. All other configuration pages are working fast and fine.
It seems to me that the LDAP-connectivity is causing this slow page.
I can't find anything suspicious in the logs or in the Windows event log.