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Perf numbers copypaste from README (misformatted on github on my browser due to linewrap):

  Device under test				Network interface	Kernel forwarding	Fastforward enabled	netmap-fwd 
 C2358 (2 core, 1.7 GHz, 4 GB RAM)		Intel I354		123 kpps		217 kpps		945 kpps
 C2758 (8 core, 2.4 GHz, 8 GB RAM)		Chelsio T520 10G	270 kpps		426 kpps		 1.683 Mpps
 Xeon-D 1540 (8 core, 2 GHz, 32 GB RAM)		Intel X552 10G		439 kpps		557 kpps		2.230 Mpps
 Xeon E3-1275 (4 core, 3.5 GHz, 32 GB RAM)	Intel X520-2 10G	1.058 Mpps		1.331 Mpps		5.053 Mpp
Whoa, that's gonna be useful for FreeNAS.
Does pfSense gain performance with this?
considering it was done by the "owners" of pfSense, I'd say yes.
not yet.

This is about routing, and pfSense is more of a NAT/packet filter platform.

IPv4 only though.
Noted, but it's not difficult to add IPv6