Depending on the router, a whole bunch: I had an ASUS router that could only maintain about 150-200 Mbps of NAT traffic using the CPU whereas with the magic cut

Depending on the router, a whole bunch: I had an ASUS router that could only maintain about 150-200 Mbps of NAT traffic using the CPU whereas with the magic cut-through blobs it could do a full 1 Gbps.