> I have 1 host that dual boots FreeBSD and Ubuntu 12.04.3 LTS and bhtyve
seems to be atleast 3 or 4 times faster with disk I/O then kvm using the
most stripped down command lines I can come up with.

I'm guessing that the default cache mode for qemu in that release is "none". You may want to switch it to "writeback", which is what bhyve does by default (it can be changed with AHCI, see bhyve(8)).

 Lots of info on the web about Qemu block i/o cache modes e.g.



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