Dispatching event to subscriber EventLogger takes more than 5000ms


For a couple of weeks I find several entries per day in my openhab.log like this:
2020-09-23 07:37:40.329 [WARN ] [me.core.internal.events.EventHandler] - Dispatching event to subscriber 'org.eclipse.smarthome.io.monitor.internal.EventLogger@1e089f9' takes more than 5000ms.
These entries appear sporadicly between 3 an 10 times per day. From time to time i also realize very long delays in Z-Wave reaktions (up to several seconds). They could or could not be related to that.

Has anyone an idea what the reason for this logfile entries could be? How can I find out the reason? I’m using the newest stable version of openhab on a Raspi 3b:
‘Linux openhab 5.4.51-v7+ #1333 SMP Mon Aug 10 16:45:19 BST 2020 armv7l’


As you’ll realize by searching other threads about this message in this forum, it’s about “something” holding things up for openHAB processing. zwave delays are likely related - but that might be cause or effect.
Finding the culprit is not easy.

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