Hi Jim,
the synchronisation of alarms between Spectrum and Portal (formerly Performance Center) has improved in the last versions in order to guarantee a better real-time update.
For example, in 22.2.10, we introduce the ability to integrate events from PM to Spectrum using Kafka
https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/spectrum/22-2/release-information/Features-and-Enhancements-22210.html#concept.dita_7844919a-5ce7-41ee-838f-60bc7bda246f_haflow
Regarding the configuration you commented, this make reference to the integration of events from PM to Spectrum using WebServices. Spectrum pulls every 60 seconds (or the configured value) events of the synchronised devices.
Portal has evolved from pulling alarms from Spectrum only over demand with Portal dashboard reload to pull them in the background and support auto-refresh in the Alarm Console.
Therefore, I recommend you to upgrade to latest version to enjoy a better experience.