It's apparently [1] often flushing new objects to add to the storage.
So a bump in the buffer configuration should help [2].
Also lots of time is spent running the to_model/from_dict [1] stanza.
As most of the cpu are usage full [3] bumping the machine's cpus to
something higher should help.
[1]
[2]
[3] https://grafana.softwareheritage.org/goto/AQRE2mInk?orgId=1