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

Banana PI R4

ubus call system board
{
        "kernel": "6.1.82",
        "hostname": "OpenWrt",
        "system": "ARMv8 Processor rev 0",
        "model": "Bananapi BPI-R4",
        "board_name": "bananapi,bpi-r4",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "SNAPSHOT",
                "revision": "r25690-b1d579f174",
                "target": "mediatek/filogic",
                "description": "OpenWrt SNAPSHOT r25690-b1d579f174"
        }
}
root@OpenWrt:/wg-bench# 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 41460 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  2.23 GBytes  19.2 Gbits/sec    0    639 KBytes
[  5]   1.00-2.00   sec  2.22 GBytes  19.1 Gbits/sec    0    639 KBytes
[  5]   2.00-3.00   sec  2.23 GBytes  19.2 Gbits/sec    0    639 KBytes
[  5]   3.00-4.00   sec  2.08 GBytes  17.9 Gbits/sec    0    639 KBytes
[  5]   4.00-5.00   sec  2.23 GBytes  19.1 Gbits/sec    0    639 KBytes
[  5]   5.00-6.00   sec  2.24 GBytes  19.3 Gbits/sec    0    639 KBytes
[  5]   6.00-7.00   sec  2.21 GBytes  19.0 Gbits/sec    0    639 KBytes
[  5]   7.00-8.00   sec  2.19 GBytes  18.8 Gbits/sec    0    639 KBytes
[  5]   8.00-9.00   sec  2.24 GBytes  19.2 Gbits/sec    0    639 KBytes
[  5]   9.00-10.00  sec  2.22 GBytes  19.1 Gbits/sec    0    639 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  22.4 GBytes  19.2 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  22.4 GBytes  19.2 Gbits/sec                  receiver