FYI

From 30th september suddenly the delay is gone after about 3 month of struggeling.
Can not tell that it is because of something i did or changed.
It looks like a (internal) proces or bug was causing this delay, CPU load dropped 1,5% avg since then.
Thank you

Thank you @walervl for pointing me in the right direction to search.
Will search some more on internet, still find it strange that something like this happens out of the blue.
These days the delay is reduced to a mximum of 10 seconds, maybe it will go back to normal in time.

Thank you for your replies.

Shutting down the slave did not help. Same behavier.
Yes there is a P1 meter installed, refresh rate is 30 seconds.
CPU load on the RPI4 is about 7% (also before the delay started to occur).

If i toggle a switch in Zwave JS-UI web interface the same delay occur.

Don't ...

RPI4 (1x slave and 1x master)
Latest Stable version
Z-zwave JS-UI Snap
Updated RPI4

The last 2 month i experience a delay in my master system (slave is working as norma).
The delay varies from 5 seconds to 150 seconds.
I tried to find how this was happening and replaced 1 node because i thought ...