There are error entries in the Windows Event log such as:

OpenFileMapping on "Global\\MF-PERF-CICSDEMO" RC 2

If a region that was enabled for event logging isn't shut down cleanly, a registry entry persists that causes cas0perf.dll to attempt to access that region's shared memory. If the region isn't currently running, the error reported in this incident will be registered in the event log.

The registry entry is:
HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\services\\Micro Focus Server\\Performance ==> Active Servers

If there are any entries for "Active Servers" where the corresponding region isn't currently running then these can be removed.

Reg Query "HKEY_LOCAL_MACHINE\\SYSTEM\\Currvices\\Micro Focus Server\\Performance" /v "Active servers"
HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\services\\Micro Focus Server\\Performance
    Active servers    REG_SZ    JCLDEMO;CICSDEMO;CICS2;ESDEMO&

Alternatively, start and stop the relevant region "cleanly" and the associated entry should be removed from this registry key.

The Windows Event Log error message contains the name of the offending region/entry, eg: OpenFileMapping on "Global\\MF-PERF-CICSDEMO" RC 2

In which case "CICSDEMO" would need to be started and stopped cleanly.