Parent Device Groups in Panorama retrieval times for user and group information

While creating a security policy, why is taking longer time to retrieve user and group information on Parent Device Groups when it is selected to add an user or group?

• Panorama
• User ID Master Device
• User ID Group Mapping / CIE

• A parent Device Group fetches the users and groups of all nested device groups according to each User ID Master Device
• In the following Device Group Hierarchy example:

• Adding users to a Security Policy in the 'Shared' Device Group

• it fetches the users and groups information according to the User ID Master Device configured in the nested Device Groups. In this case 5 Device Groups: LDAP group mappings of vpfw22, vpfw11/vsys1, vpfw11/vsys2, vpfw11/vsys; and the CIE-OktaDev