When you open the "Manage->Policies->User Group" page on DLP enforce console the page loads slow compared to other pages on the Enforce console.
When the user group page is opened an LDAP query is made to Active Directory server to verify all the user groups and users created on enforce.
Based on the number of user groups and users, the LDAP query takes time to finish.
Once the LDAP query is returned by AD the 'User Group' page loads.
This is expected behavior with 50 to 60 user groups.
This Wireshark captures shows the time spent in communicating with LDAP.
The 'user group' page took 1.5 to 2 minutes to load, out of which 1.34 sec was taken by LDAP query.