Just installed iperf3 to try it. Iām getting waay less. Also on 6GHz.
iperf3.exe -c 192.168.100.100
Connecting to host 192.168.100.100, port 5201
[ 4] local 192.168.100.93 port 2148 connected to 192.168.100.100 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 58.0 MBytes 485 Mbits/sec
[ 4] 1.00-2.00 sec 68.8 MBytes 576 Mbits/sec
[ 4] 2.00-3.00 sec 72.8 MBytes 611 Mbits/sec
[ 4] 3.00-4.00 sec 74.5 MBytes 626 Mbits/sec
[ 4] 4.00-5.00 sec 75.6 MBytes 634 Mbits/sec
[ 4] 5.00-6.00 sec 75.0 MBytes 629 Mbits/sec
[ 4] 6.00-7.00 sec 71.4 MBytes 599 Mbits/sec
[ 4] 7.00-8.00 sec 73.8 MBytes 619 Mbits/sec
[ 4] 8.00-9.00 sec 73.1 MBytes 613 Mbits/sec
[ 4] 9.00-10.00 sec 72.2 MBytes 607 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 715 MBytes 600 Mbits/sec sender
[ 4] 0.00-10.00 sec 715 MBytes 600 Mbits/sec receiver
I thought it was because of the placement because thereās like half a foot of a wall blocking direct line of sight so I thought it might be attenuation from that, so I just moved it a couple feet to the middle of the corridor where it has (a more or less - thereās two chairs in the way lol) direct los to the adapter, some 7 meters away
iperf3.exe -c 192.168.100.100
Connecting to host 192.168.100.100, port 5201
[ 4] local 192.168.100.93 port 2155 connected to 192.168.100.100 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 53.6 MBytes 449 Mbits/sec
[ 4] 1.00-2.00 sec 66.6 MBytes 559 Mbits/sec
[ 4] 2.00-3.00 sec 67.4 MBytes 564 Mbits/sec
[ 4] 3.00-4.00 sec 71.0 MBytes 596 Mbits/sec
[ 4] 4.00-5.00 sec 75.8 MBytes 636 Mbits/sec
[ 4] 5.00-6.00 sec 70.6 MBytes 590 Mbits/sec
[ 4] 6.00-7.00 sec 70.9 MBytes 596 Mbits/sec
[ 4] 7.00-8.00 sec 72.9 MBytes 612 Mbits/sec
[ 4] 8.00-9.00 sec 74.4 MBytes 624 Mbits/sec
[ 4] 9.00-10.00 sec 77.2 MBytes 649 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 700 MBytes 588 Mbits/sec sender
[ 4] 0.00-10.00 sec 700 MBytes 588 Mbits/sec receiver
Somewhat perplexed, I moved the router one meter away from the adapter:
iperf3.exe -c 192.168.100.100
Connecting to host 192.168.100.100, port 5201
[ 4] local 192.168.100.93 port 2235 connected to 192.168.100.100 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 49.9 MBytes 418 Mbits/sec
[ 4] 1.00-2.00 sec 54.2 MBytes 455 Mbits/sec
[ 4] 2.00-3.00 sec 63.9 MBytes 536 Mbits/sec
[ 4] 3.00-4.00 sec 63.9 MBytes 536 Mbits/sec
[ 4] 4.00-5.00 sec 71.1 MBytes 595 Mbits/sec
[ 4] 5.00-6.00 sec 65.5 MBytes 549 Mbits/sec
[ 4] 6.00-7.00 sec 73.6 MBytes 620 Mbits/sec
[ 4] 7.00-8.00 sec 69.0 MBytes 578 Mbits/sec
[ 4] 8.00-9.00 sec 68.8 MBytes 577 Mbits/sec
[ 4] 9.00-10.00 sec 72.2 MBytes 607 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 652 MBytes 547 Mbits/sec sender
[ 4] 0.00-10.00 sec 652 MBytes 547 Mbits/sec receiver
Exact same numbers. While Iām glad itās not a placement issue, shouldnāt those numbers be twice as high? Seriously, what gives? 
Windows reports a link speed of 2882Mbits and the signal strength is excellent (full bars on the taskbar - in all of the three tests).
Iām running snapshot r30728-3aee42001f for what itās worth but I doubt thatās relevant in this case.
(And Iām getting half those numbers on 5Ghz, but thatās to be expected since thatās what im using for the wireless backhaul). But the 6Ghz range? I really I donāt think I should be getting those numbers 
Any ideas?
Edit: Just tried switching it to AX instead of BE. Still the same numbers 
This is what it looks like in LuCi.