Help speed up my Dell C6220 hypervisors

I'm using three nodes of a Dell PowerEdge C6220 unit as a Proxmox VE cluster (which uses my TrueNAS CORE box for some of its storage, hence a tenuous connection to this forum). ISOs and some low-demand VM disk images are stored on the TrueNAS server, but most of the live disk images are stored on a Ceph pool consisting of three, 2TB Samsung EVO 860 SSDs, one in each node. The nodes are linked together via 10 Gb fiber with Chelsio T420 cards. And while performance is a whole lot better...

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