VM disk performance issues

I hadn't noticed this previously as most of my VMs are pretty light in disk I/O, but after installing a Win10 VM for some game streaming experiments I found it to be somewhat sluggish. I ran some disk benchmarks in the hypervisor as well as a Linux VM and the Win10 VM. The Linux VM benchmark showed half the throughput and IOPS as the parent hypervisor benchmark, and the Win10 VM had about a quarter the throughput and IOPS.
The volume with the VM disks is 4 SAS SSDs arranged in a ZFS stripe...

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