ZCC very slow on calendar popup

With many devices in the zone, running ZCC > Configuration > System Information > Maximum Errors 1000 > Message Cleanup to select the Calendar browser results in long delay before calendar dialog appears.

This is fixed in version 10.2.1 - see KB 7003766 "ZENworks 10 Configuration Management 10.2.1 - update information and list of fixes" which can be found at https://www.novell.com/support