I've recently got 1Gbit ethernet uplink, and I only get around 300mbit of NAT through CHR in a virtualbox. Is this expected or something is off here? Does anybody have better experience with ESXi on i3 level CPU? just in case: win7 host, virtio, KVM, intel I350 card. routing speed (no NAT) was around 3Gbps on a dumb loopback interface so it's not like I'm hitting some CHR limitation wall, it is just NAT performance in this setup. host itself can do 930-950 mbit on speedtest, though there is no NAT involved in this scenario.
Any insights into your real world NAT performance with CHR will be appreciated.