Disable ZIL and test again. NFS does a lot of sync writes and kills
performance. Disabling ZIL (or using the synchronicity option if a build with
that ever comes out) will prevent that behavior, and should get your NFS
performance close to local. It's up to you if you want to leave it that way.
There are reasons not to as well. NFS clients can get corrupted views of the
filesystem should the server go down before a write flush is completed. ZIL
prevents that problem. In my case, the clients aren't on a UPS while the server
is, so it's not an issue. :)
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