ZENworks Configuration Management login in a Terminal server or a Citrix environment can be slow under the following circumstances:
If there are more than 25 users logging in simultaneously, and each user has bundles configured to launch at login.
If NAL is set to launch on user login in a terminal server environment
If Random Refresh is disabled on the terminal server.
If the Batch Refresh feature is not used. For information on batch refresh, see Section D.4, Best Practices to Optimize ZENworks User Login Times