Please run iperf3 -c 127.0.0.1 and post results here to make router database

ASUS RT-AX1800S (aka RT-AX54 / RT-AX54HP / RT-AX1800HP):

root@OpenWrt:~# ubus call system board
{
        "kernel": "5.15.137",
        "hostname": "OpenWrt",
        "system": "MediaTek MT7621 ver:1 eco:4",
        "model": "ASUS RT-AX54",
        "board_name": "asus,rt-ax54",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "23.05.2",
                "revision": "r23630-842932a63d",
                "target": "ramips/mt7621",
                "description": "OpenWrt 23.05.2 r23630-842932a63d"
        }
}
root@OpenWrt:~# iperf3 -c 127.0.0.1
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 54004 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  72.4 MBytes   606 Mbits/sec    0    639 KBytes
[  5]   1.00-2.00   sec  71.2 MBytes   598 Mbits/sec    0   1.25 MBytes
[  5]   2.00-3.00   sec  72.5 MBytes   608 Mbits/sec    0   1.25 MBytes
[  5]   3.00-4.00   sec  70.9 MBytes   595 Mbits/sec    0   1.25 MBytes
[  5]   4.00-5.00   sec  71.5 MBytes   600 Mbits/sec    0   1.25 MBytes
[  5]   5.00-6.00   sec  71.9 MBytes   603 Mbits/sec    0   1.25 MBytes
[  5]   6.00-7.00   sec  71.5 MBytes   600 Mbits/sec    0   1.25 MBytes
[  5]   7.00-8.00   sec  72.8 MBytes   610 Mbits/sec    0   1.25 MBytes
[  5]   8.00-9.00   sec  69.1 MBytes   580 Mbits/sec    0   1.25 MBytes
[  5]   9.00-10.00  sec  64.4 MBytes   539 Mbits/sec    0   1.25 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   728 MBytes   610 Mbits/sec    0             sender
[  5]   0.00-10.00  sec   728 MBytes   610 Mbits/sec                  receiver

iperf Done.

==========================
QOTOM Mini PC with software and hardware Routing/NAT Offloading disabled (default):

root@OpenWrt:~# ubus call system board
{
        "kernel": "5.15.137",
        "hostname": "OpenWrt",
        "system": "Intel(R) Core(TM) i3-4030U CPU @ 1.90GHz",
        "model": "INTEL Corporation Q3XXG4-P",
        "board_name": "intel-corporation-q3xxg4-p",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "23.05.2",
                "revision": "r23630-842932a63d",
                "target": "x86/64",
                "description": "OpenWrt 23.05.2 r23630-842932a63d"
        }
}
root@OpenWrt:~# iperf3 -s -D && iperf3 -c 127.0.0.1
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 51796 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  2.33 GBytes  20.0 Gbits/sec    0    959 KBytes
[  5]   1.00-2.00   sec  2.95 GBytes  25.4 Gbits/sec    0   1.31 MBytes
[  5]   2.00-3.00   sec  2.90 GBytes  24.9 Gbits/sec    0   1.31 MBytes
[  5]   3.00-4.00   sec  2.76 GBytes  23.7 Gbits/sec    0   1.31 MBytes
[  5]   4.00-5.00   sec  2.95 GBytes  25.3 Gbits/sec    0   1.31 MBytes
[  5]   5.00-6.00   sec  3.10 GBytes  26.7 Gbits/sec    0   1.31 MBytes
[  5]   6.00-7.00   sec  2.91 GBytes  25.0 Gbits/sec    0   1.31 MBytes
[  5]   7.00-8.00   sec  2.92 GBytes  25.1 Gbits/sec    0   1.31 MBytes
[  5]   8.00-9.00   sec  2.89 GBytes  24.9 Gbits/sec    0   1.31 MBytes
[  5]   9.00-10.00  sec  2.75 GBytes  23.6 Gbits/sec    0   1.31 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  30.3 GBytes  26.0 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  30.3 GBytes  26.0 Gbits/sec                  receiver

iperf Done.

and enabled. No real benefits in performance, but bitrate wildly fluctuates:

root@OpenWrt:~# iperf3 -s -D && iperf3 -c 127.0.0.1
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 57904 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  3.12 GBytes  26.8 Gbits/sec    0   1.06 MBytes
[  5]   1.00-2.00   sec  2.15 GBytes  18.5 Gbits/sec    0   1.06 MBytes
[  5]   2.00-3.00   sec  2.96 GBytes  25.4 Gbits/sec    0   1.06 MBytes
[  5]   3.00-4.00   sec  1.28 GBytes  11.0 Gbits/sec    0   1.06 MBytes
[  5]   4.00-5.00   sec   230 MBytes  1.93 Gbits/sec    0   1.12 MBytes
[  5]   5.00-6.00   sec   848 MBytes  7.11 Gbits/sec    0   1.12 MBytes
[  5]   6.00-7.00   sec  3.06 GBytes  26.2 Gbits/sec    0   1.12 MBytes
[  5]   7.00-8.00   sec  3.07 GBytes  26.4 Gbits/sec    0   1.12 MBytes
[  5]   8.00-9.00   sec  2.69 GBytes  23.1 Gbits/sec    0   1.12 MBytes
[  5]   9.00-10.95  sec   128 KBytes   537 Kbits/sec    0   1.12 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.95  sec  33.7 GBytes  26.5 Gbits/sec    0             sender
[  5]   0.00-10.95  sec  33.7 GBytes  26.5 Gbits/sec                  receiver

iperf Done.
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