What kind of NAS are you testing to? If it's a FreeNAS and I recall correctly iSCSI does sync writes by default and NFS doesn't. Without a ZIL SSD you're going to see a pretty massive performance difference.
From my latest testing with Proxmox 4.4 swapping on a ZVOL will still cause crashing once memory pressure gets too high and you actually start to use the swap. My solution to this has been to install proxmox on a small mdadm fake raid and create the ZFS pools after the fact. Your solution does...
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