Cross referencing another thread with very similar symptoms, my hunch is it may be related.
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RHCE, author of zbxapi
Ansible, the missing piece (Zabconf 2017): https://www.youtube.com/watch?v=R5T9NidjjDE
Zabbix and SNMP on Linux (Zabconf 2015): https://www.youtube.com/watch?v=98PEHpLFVHM
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Suspicion
I've suspected for a while that the items queries pulls in all items for a host even when paging. I think this is requiring a large number of calls for each row even when most of those aren't displayed.
-PaulComment
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