When you launch GPOAdmin MMC Console on the GPOAdmin server and connect to the local server, the MMC Console may not be very responsive when browsing the managed domain(s) and objects under version control.
If you connect from a remote machine GPOAdmin MMC Console is much more responsive.
An issue with Microsoft .NET Framework 4.0 remoting when communicating between a client and server on the same host.
This issue does not happen when the client and server are on different hosts. In that scenario FQDN and credentials do not slow the system down.
The issue causes re-authenticating from the same machine to itself when making network calls. This includes enumerating the bjects under version control root.
The following workaround is applicable when launching the MMC Console on the GPOAdmin server only.
WORKAROUND 1 (Recommended)
Once the steps above are completed, remove the stored connection strings from the registry as follows:
Note: If other users will be using GPOAdmin on the server, repeat all of the above for each user.