@gwlim I ran some Archer C7 tests too. It looks like HW NAT is active and makes a difference, but right now I'm seeing a performance degradation. [tests removed because the degraded performance was caused by other factors]
NAT with other firmware - 484mb/s
NAT on the April NAT build - 395mb/s - with a lot of jitter in the speed
Direct switch connection - 891mb/s - probably not relevant but doing the extra test was easy
C7 Direct Switch-Switch
PS C:\Users\denis\Desktop\iperf-3.1.3-win64> .\iperf3.exe iperf -c 10.5.1.15
Connecting to host 10.5.1.15, port 5201
[ 4] local 10.5.1.184 port 51425 connected to 10.5.1.15 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 106 MBytes 889 Mbits/sec
[ 4] 1.00-2.00 sec 105 MBytes 882 Mbits/sec
[ 4] 2.00-3.00 sec 106 MBytes 892 Mbits/sec
[ 4] 3.00-4.00 sec 106 MBytes 893 Mbits/sec
[ 4] 4.00-5.00 sec 106 MBytes 893 Mbits/sec
[ 4] 5.00-6.00 sec 106 MBytes 892 Mbits/sec
[ 4] 6.00-7.00 sec 106 MBytes 892 Mbits/sec
[ 4] 7.00-8.00 sec 106 MBytes 893 Mbits/sec
[ 4] 8.00-9.00 sec 106 MBytes 891 Mbits/sec
[ 4] 9.00-10.00 sec 106 MBytes 891 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 1.04 GBytes 891 Mbits/sec sender
[ 4] 0.00-10.00 sec 1.04 GBytes 891 Mbits/sec receiver
C7 Without Hardware NAT
PS C:\Users\denis\Desktop\iperf-3.1.3-win64> .\iperf3.exe iperf -c 10.5.1.15
Connecting to host 10.5.1.15, port 5201
[ 4] local 192.168.1.184 port 50634 connected to 10.5.1.15 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 59.8 MBytes 501 Mbits/sec
[ 4] 1.00-2.00 sec 58.5 MBytes 491 Mbits/sec
[ 4] 2.00-3.00 sec 59.5 MBytes 499 Mbits/sec
[ 4] 3.00-4.00 sec 57.4 MBytes 481 Mbits/sec
[ 4] 4.00-5.00 sec 59.6 MBytes 500 Mbits/sec
[ 4] 5.00-6.00 sec 58.2 MBytes 489 Mbits/sec
[ 4] 6.00-7.00 sec 49.4 MBytes 414 Mbits/sec
[ 4] 7.00-8.00 sec 57.1 MBytes 479 Mbits/sec
[ 4] 8.00-9.00 sec 59.4 MBytes 499 Mbits/sec
[ 4] 9.00-10.00 sec 58.2 MBytes 489 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 577 MBytes 484 Mbits/sec sender
[ 4] 0.00-10.00 sec 577 MBytes 484 Mbits/sec receiver
C7 With Hardware NAT
<this test has been removed because I didn't account for other traffic on the network and it was innacurate>