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"openstack server list" takes 30s


I built a Ussuri cluster with 3 controllers and 5 compute nodes.
OpenStack CLI ran pretty fast at the beginning, but gets slower
over time along with increased workloads. Right now, it takes
about 30s to list 10 VMs. The CPU, memory and disk usage are on
those 3 controllers are all in the range. I understand there are
many API calls happening behind CLI. I'd like to figure out how
this 30s is consumed, which call is the killer.
Any guidance or hint would be helpful.