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

$ neofetch
             .',;::::;,'.                fcc@fedora 
         .';:cccccccccccc:;,.            ---------- 
      .;cccccccccccccccccccccc;.         OS: Fedora Linux 38 (Sway Prerelease) x86_64 
    .:cccccccccccccccccccccccccc:.       Kernel: 6.2.0-0.rc8.57.fc38.x86_64 
  .;ccccccccccccc;.:dddl:.;ccccccc;.     Uptime: 11 mins 
 .:ccccccccccccc;OWMKOOXMWd;ccccccc:.    Packages: 1445 (rpm) 
.:ccccccccccccc;KMMc;cc;xMMc:ccccccc:.   Shell: bash 5.2.15 
,cccccccccccccc;MMM.;cc;;WW::cccccccc,   Resolution: 1920x1200 
:cccccccccccccc;MMM.;cccccccccccccccc:   Terminal: /dev/pts/1 
:ccccccc;oxOOOo;MMM0OOk.;cccccccccccc:   CPU: AMD A10-7850K Radeon R7 4C+8G (4) @ 3.700GHz 
cccccc:0MMKxdd:;MMMkddc.;cccccccccccc;   GPU: AMD ATI Radeon R7 Graphics 
ccccc:XM0';cccc;MMM.;cccccccccccccccc'   Memory: 931MiB / 14925MiB 
ccccc;MMo;ccccc;MMW.;ccccccccccccccc;
ccccc;0MNc.ccc.xMMd:ccccccccccccccc;                             
cccccc;dNMWXXXWM0::cccccccccccccc:,                              
cccccccc;.:odl:.;cccccccccccccc:,.
:cccccccccccccccccccccccccccc:'.
.:cccccccccccccccccccccc:;,..
  '::cccccccccccccc::;,.

$ iperf3 -s -D -1 && iperf3 -c 127.0.0.1
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 36946 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  2.88 GBytes  24.7 Gbits/sec    0   1023 KBytes       
[  5]   1.00-2.00   sec  3.11 GBytes  26.7 Gbits/sec    0   1023 KBytes       
[  5]   2.00-3.00   sec  3.13 GBytes  26.9 Gbits/sec    0   1023 KBytes       
[  5]   3.00-4.00   sec  3.19 GBytes  27.4 Gbits/sec    0   1.56 MBytes       
[  5]   4.00-5.00   sec  3.27 GBytes  28.1 Gbits/sec    0   1.56 MBytes       
[  5]   5.00-6.00   sec  3.22 GBytes  27.7 Gbits/sec    0   1.56 MBytes       
[  5]   6.00-7.00   sec  3.15 GBytes  27.1 Gbits/sec    0   1.56 MBytes       
[  5]   7.00-8.00   sec  2.67 GBytes  23.0 Gbits/sec    0   1.56 MBytes       
[  5]   8.00-9.00   sec  3.15 GBytes  27.0 Gbits/sec    0   1.56 MBytes       
[  5]   9.00-10.00  sec  3.26 GBytes  28.0 Gbits/sec    0   1.56 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  31.0 GBytes  26.7 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  31.0 GBytes  26.7 Gbits/sec                  receiver

iperf Done.
Hostname OpenWrt
Model Linksys WRT1900ACS
Architecture ARMv7 Processor rev 1 (v7l)
Target Platform mvebu/cortexa9
Firmware Version OpenWrt SNAPSHOT r22124-bfa5e4e4eb / LuCI Master git-23.039.28596-41e9b8d
Kernel Version 5.15.94

BusyBox v1.36.0 (2023-02-19 12:04:59 UTC) built-in shell (ash)

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt SNAPSHOT, r22124-bfa5e4e4eb
 -----------------------------------------------------
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 44296 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   476 MBytes  3.99 Gbits/sec    0   4.43 MBytes
[  5]   1.00-2.00   sec   474 MBytes  3.97 Gbits/sec    0   4.43 MBytes
[  5]   2.00-3.00   sec   472 MBytes  3.97 Gbits/sec    0   4.43 MBytes
[  5]   3.00-4.00   sec   474 MBytes  3.97 Gbits/sec    0   4.43 MBytes
[  5]   4.00-5.00   sec   475 MBytes  3.98 Gbits/sec    0   4.43 MBytes
[  5]   5.00-6.00   sec   474 MBytes  3.97 Gbits/sec    0   4.43 MBytes
[  5]   6.00-7.00   sec   475 MBytes  3.98 Gbits/sec    0   4.43 MBytes
[  5]   7.00-8.00   sec   474 MBytes  3.98 Gbits/sec    0   4.43 MBytes
[  5]   8.00-9.00   sec   475 MBytes  3.99 Gbits/sec    0   4.43 MBytes
[  5]   9.00-10.00  sec   474 MBytes  3.98 Gbits/sec    0   4.43 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  4.63 GBytes  3.98 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  4.63 GBytes  3.97 Gbits/sec                  receiver

iperf Done.
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 60784 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   869 MBytes  7.28 Gbits/sec    0   1023 KBytes
[  5]   1.00-2.00   sec   484 MBytes  4.06 Gbits/sec    0   1023 KBytes
[  5]   2.00-3.00   sec   485 MBytes  4.07 Gbits/sec    0   1023 KBytes
[  5]   3.00-4.00   sec   486 MBytes  4.08 Gbits/sec    0   1023 KBytes
[  5]   4.00-5.00   sec   488 MBytes  4.09 Gbits/sec    0   1023 KBytes
[  5]   5.00-6.00   sec   488 MBytes  4.09 Gbits/sec    0   1023 KBytes
[  5]   6.00-7.00   sec   489 MBytes  4.10 Gbits/sec    0   1023 KBytes
[  5]   7.00-8.00   sec   486 MBytes  4.08 Gbits/sec    0   1023 KBytes
[  5]   8.00-9.00   sec   488 MBytes  4.09 Gbits/sec    0   1023 KBytes
[  5]   9.00-10.00  sec  1.02 GBytes  8.80 Gbits/sec    0   1.12 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  5.67 GBytes  4.87 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  5.67 GBytes  4.87 Gbits/sec                  receiver

iperf Done.
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 55372 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   488 MBytes  4.09 Gbits/sec    0   4.37 MBytes
[  5]   1.00-2.00   sec   481 MBytes  4.03 Gbits/sec    0   4.37 MBytes
[  5]   2.00-3.00   sec   486 MBytes  4.08 Gbits/sec    0   4.37 MBytes
[  5]   3.00-4.00   sec   488 MBytes  4.09 Gbits/sec    0   4.37 MBytes
[  5]   4.00-5.00   sec   488 MBytes  4.09 Gbits/sec    0   4.37 MBytes
[  5]   5.00-6.00   sec   489 MBytes  4.10 Gbits/sec    0   4.37 MBytes
[  5]   6.00-7.00   sec   489 MBytes  4.10 Gbits/sec    0   4.37 MBytes
[  5]   7.00-8.00   sec   488 MBytes  4.09 Gbits/sec    0   4.37 MBytes
[  5]   8.00-9.00   sec   489 MBytes  4.10 Gbits/sec    0   4.37 MBytes
[  5]   9.00-10.00  sec   490 MBytes  4.11 Gbits/sec    0   4.37 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  4.76 GBytes  4.09 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  4.75 GBytes  4.08 Gbits/sec                  receiver

iperf Done.
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 58824 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1.13 GBytes  9.71 Gbits/sec    0   2.06 MBytes
[  5]   1.00-2.00   sec   486 MBytes  4.08 Gbits/sec    0   2.06 MBytes
[  5]   2.00-3.00   sec   489 MBytes  4.10 Gbits/sec    0   2.06 MBytes
[  5]   3.00-4.00   sec   488 MBytes  4.09 Gbits/sec    0   2.06 MBytes
[  5]   4.00-5.00   sec   490 MBytes  4.11 Gbits/sec    0   2.06 MBytes
[  5]   5.00-6.00   sec   491 MBytes  4.13 Gbits/sec    0   2.06 MBytes
[  5]   6.00-7.00   sec   490 MBytes  4.11 Gbits/sec    0   2.06 MBytes
[  5]   7.00-8.00   sec   491 MBytes  4.12 Gbits/sec    0   2.06 MBytes
[  5]   8.00-9.00   sec   484 MBytes  4.05 Gbits/sec    0   2.06 MBytes
[  5]   9.00-10.00  sec   739 MBytes  6.20 Gbits/sec    0   2.06 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  5.67 GBytes  4.87 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  5.66 GBytes  4.86 Gbits/sec                  receiver

iperf Done.
root@OpenWrt:~#

NETGEAR WAX206

BusyBox v1.36.0 (2023-02-19 18:44:39 UTC) built-in shell (ash)

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt SNAPSHOT, r22117-7ae4716243
 -----------------------------------------------------
root@OpenWrt:~# iperf3 -s -D -1 && iperf3 -c 127.0.0.1
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 36842 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   661 MBytes  5.54 Gbits/sec    0   1.19 MBytes
[  5]   1.00-2.00   sec   656 MBytes  5.50 Gbits/sec    0   1.19 MBytes
[  5]   2.00-3.00   sec   622 MBytes  5.22 Gbits/sec    0   1.56 MBytes
[  5]   3.00-4.00   sec   646 MBytes  5.43 Gbits/sec    0   1.56 MBytes
[  5]   4.00-5.00   sec   641 MBytes  5.38 Gbits/sec    0   1.56 MBytes
[  5]   5.00-6.00   sec   649 MBytes  5.44 Gbits/sec    0   1.56 MBytes
[  5]   6.00-7.00   sec   646 MBytes  5.42 Gbits/sec    0   1.56 MBytes
[  5]   7.00-8.00   sec   642 MBytes  5.40 Gbits/sec    0   1.56 MBytes
[  5]   8.00-9.00   sec   652 MBytes  5.47 Gbits/sec    0   1.56 MBytes
[  5]   9.00-10.00  sec   650 MBytes  5.46 Gbits/sec    0   1.56 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  6.32 GBytes  5.43 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  6.31 GBytes  5.42 Gbits/sec                  receiver

iperf Done.

WiFire S1500.NBN

BusyBox v1.36.0 (2023-02-21 15:33:46 UTC) built-in shell (ash)

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt SNAPSHOT, r22130-2ade7e3dd4
 -----------------------------------------------------
root@S1500NBN:~# iperf3 -s -D -1 && iperf3 -c 127.0.0.1
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 59694 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  83.8 MBytes   702 Mbits/sec    0    831 KBytes
[  5]   1.00-2.00   sec  92.4 MBytes   773 Mbits/sec    0   1.31 MBytes
[  5]   2.00-3.01   sec  94.9 MBytes   792 Mbits/sec    0   1.31 MBytes
[  5]   3.01-4.02   sec  87.9 MBytes   732 Mbits/sec    0   1.31 MBytes
[  5]   4.02-5.01   sec  78.8 MBytes   665 Mbits/sec    0   1.31 MBytes
[  5]   5.01-6.01   sec  80.6 MBytes   676 Mbits/sec    0   1.31 MBytes
[  5]   6.01-7.01   sec  95.0 MBytes   797 Mbits/sec    0   1.31 MBytes
[  5]   7.01-8.01   sec  93.2 MBytes   781 Mbits/sec    0   1.31 MBytes
[  5]   8.01-9.00   sec  86.2 MBytes   730 Mbits/sec    0   1.31 MBytes
[  5]   9.00-10.00  sec  95.0 MBytes   796 Mbits/sec    0   1.31 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   888 MBytes   744 Mbits/sec    0             sender
[  5]   0.00-10.00  sec   887 MBytes   744 Mbits/sec                  receiver

iperf Done.
root@S1500NBN:~#

AVM FRITZ!BOX 4040

root@R4040:~# 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 39304 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   171 MBytes  1.43 Gbits/sec    0   1.19 MBytes       
[  5]   1.00-2.00   sec   179 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
[  5]   2.00-3.00   sec   179 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
[  5]   3.00-4.00   sec   180 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
[  5]   4.00-5.00   sec   179 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
[  5]   5.00-6.00   sec   179 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
[  5]   6.00-7.00   sec   179 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
[  5]   7.00-8.00   sec   179 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
[  5]   8.00-9.01   sec   180 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
[  5]   9.01-10.00  sec   179 MBytes  1.50 Gbits/sec    0   1.19 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.74 GBytes  1.49 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  1.74 GBytes  1.49 Gbits/sec                  receiver

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt SNAPSHOT, r22246-9d8374cadc
 -----------------------------------------------------
root@OpenWrt:~# iperf3 -c 127.0.0.1
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 46480 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  5.77 GBytes  49.6 Gbits/sec    0    895 KBytes
[  5]   1.00-2.00   sec  5.85 GBytes  50.2 Gbits/sec    0    895 KBytes
[  5]   2.00-3.00   sec  5.84 GBytes  50.2 Gbits/sec    0    895 KBytes
[  5]   3.00-4.00   sec  5.81 GBytes  49.9 Gbits/sec    0    895 KBytes
[  5]   4.00-5.00   sec  5.75 GBytes  49.4 Gbits/sec    0   1.12 MBytes
[  5]   5.00-6.00   sec  5.67 GBytes  48.7 Gbits/sec    0    895 KBytes
[  5]   6.00-7.00   sec  5.73 GBytes  49.2 Gbits/sec    0   1023 KBytes
[  5]   7.00-8.00   sec  5.68 GBytes  48.8 Gbits/sec    0   1023 KBytes
[  5]   8.00-9.00   sec  5.78 GBytes  49.7 Gbits/sec    0    895 KBytes
[  5]   9.00-10.00  sec  5.72 GBytes  49.1 Gbits/sec    0   1023 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  57.6 GBytes  49.5 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  57.6 GBytes  49.5 Gbits/sec                  receiver

iperf Done.

GL-iNet Flint AX1800

Linux OpenWrt 5.15.86 #0 SMP Sun Mar 19 09:43:22 2023 aarch64 GNU/Linux
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 54148 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   651 MBytes  5.46 Gbits/sec    0    767 KBytes
[  5]   1.00-2.00   sec   652 MBytes  5.47 Gbits/sec    0    895 KBytes
[  5]   2.00-3.00   sec   660 MBytes  5.53 Gbits/sec    0    895 KBytes
[  5]   3.00-4.00   sec   661 MBytes  5.55 Gbits/sec    0    895 KBytes
[  5]   4.00-5.00   sec   648 MBytes  5.43 Gbits/sec    0    895 KBytes
[  5]   5.00-6.00   sec   651 MBytes  5.47 Gbits/sec    0    895 KBytes
[  5]   6.00-7.00   sec   661 MBytes  5.54 Gbits/sec    0    895 KBytes
[  5]   7.00-8.00   sec   658 MBytes  5.52 Gbits/sec    0    895 KBytes
[  5]   8.00-9.00   sec   669 MBytes  5.61 Gbits/sec    0    895 KBytes
[  5]   9.00-10.00  sec   650 MBytes  5.45 Gbits/sec    1    895 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  6.41 GBytes  5.50 Gbits/sec    1             sender
[  5]   0.00-10.00  sec  6.40 GBytes  5.50 Gbits/sec                  receiver
2 Likes

TP-Link Archer C7 v5

Linux ArcherC7v5 5.10.161 #0 Tue Jan 3 00:24:21 2023 mips GNU/Linux

root@ArcherC7v5:~# iperf3 -s -D && iperf3 -c 127.0.0.1 port 5201
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 34064 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.01   sec  50.4 MBytes   416 Mbits/sec    0   1.06 MBytes
[  5]   1.01-2.00   sec  49.2 MBytes   418 Mbits/sec    0   1.06 MBytes
[  5]   2.00-3.00   sec  51.2 MBytes   430 Mbits/sec    0   1.06 MBytes
[  5]   3.00-4.00   sec  49.9 MBytes   418 Mbits/sec    0   1.06 MBytes
[  5]   4.00-5.00   sec  50.6 MBytes   425 Mbits/sec    0   1.06 MBytes
[  5]   5.00-6.00   sec  53.4 MBytes   448 Mbits/sec    0   1.06 MBytes
[  5]   6.00-7.00   sec  51.6 MBytes   433 Mbits/sec    0   1.06 MBytes
[  5]   7.00-8.00   sec  53.5 MBytes   449 Mbits/sec    0   1.06 MBytes
[  5]   8.00-9.00   sec  51.6 MBytes   433 Mbits/sec    0   1.06 MBytes
[  5]   9.00-10.00  sec  52.6 MBytes   440 Mbits/sec    0   1.06 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   514 MBytes   431 Mbits/sec    0             sender
[  5]   0.00-10.01  sec   513 MBytes   430 Mbits/sec                  receiver

iperf Done.
root@ArcherC7v5:~#

Dynalink DL-WRX36
OpenWrt SNAPSHOT, r22322-b844716158

iperf3 -s -D && iperf3 -c 127.0.0.1 port 5201
Connecting to host 127.0.0.1, port 5201
[  5] local 127.0.0.1 port 56642 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   830 MBytes  6.96 Gbits/sec    0   1.69 MBytes
[  5]   1.00-2.00   sec   815 MBytes  6.84 Gbits/sec    0   1.69 MBytes
[  5]   2.00-3.00   sec   818 MBytes  6.86 Gbits/sec    0   1.69 MBytes
[  5]   3.00-4.00   sec   816 MBytes  6.85 Gbits/sec    0   1.69 MBytes
[  5]   4.00-5.00   sec   818 MBytes  6.86 Gbits/sec    0   1.69 MBytes
[  5]   5.00-6.00   sec   816 MBytes  6.85 Gbits/sec    0   1.69 MBytes
[  5]   6.00-7.00   sec   812 MBytes  6.81 Gbits/sec    0   1.69 MBytes
[  5]   7.00-8.00   sec   812 MBytes  6.81 Gbits/sec    0   1.69 MBytes
[  5]   8.00-9.00   sec   811 MBytes  6.80 Gbits/sec    0   1.69 MBytes
[  5]   9.00-10.00  sec   810 MBytes  6.80 Gbits/sec    0   1.69 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  7.97 GBytes  6.84 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  7.96 GBytes  6.84 Gbits/sec                  receiver

tp-link Archer C2600 v1.1
OpenWrt 22.03.3 APCCV (NSS) release

root@APCCV:~# 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 45992 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   407 MBytes  3.41 Gbits/sec    0   1.25 MBytes
[  5]   1.00-2.00   sec   404 MBytes  3.39 Gbits/sec    0   1.25 MBytes
[  5]   2.00-3.00   sec   412 MBytes  3.46 Gbits/sec    0   1.25 MBytes
[  5]   3.00-4.00   sec   412 MBytes  3.46 Gbits/sec    0   1.25 MBytes
[  5]   4.00-5.00   sec   405 MBytes  3.39 Gbits/sec    0   1.25 MBytes
[  5]   5.00-6.00   sec   416 MBytes  3.50 Gbits/sec    0   1.25 MBytes
[  5]   6.00-7.00   sec   410 MBytes  3.44 Gbits/sec    0   1.25 MBytes
[  5]   7.00-8.00   sec   405 MBytes  3.40 Gbits/sec    0   1.25 MBytes
[  5]   8.00-9.00   sec   412 MBytes  3.46 Gbits/sec    0   1.25 MBytes
[  5]   9.00-10.00  sec   412 MBytes  3.46 Gbits/sec    0   1.25 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  4.00 GBytes  3.44 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  4.00 GBytes  3.43 Gbits/sec                  receiver

iperf Done.

GL-MT300N-V2

~# 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 41944 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.01   sec  45.4 MBytes   377 Mbits/sec    0   1.06 MBytes
[  5]   1.01-2.01   sec  44.1 MBytes   370 Mbits/sec    0   1.06 MBytes
[  5]   2.01-3.01   sec  45.0 MBytes   377 Mbits/sec    0   1.06 MBytes
[  5]   3.01-4.02   sec  45.4 MBytes   379 Mbits/sec    0   1.06 MBytes
[  5]   4.02-5.00   sec  44.1 MBytes   375 Mbits/sec    0   1.06 MBytes
[  5]   5.00-6.02   sec  45.6 MBytes   377 Mbits/sec    0   1.06 MBytes
[  5]   6.02-7.02   sec  44.2 MBytes   372 Mbits/sec    0   1.06 MBytes
[  5]   7.02-8.03   sec  44.8 MBytes   372 Mbits/sec    0   1.06 MBytes
[  5]   8.03-9.02   sec  44.5 MBytes   376 Mbits/sec    0   1.06 MBytes
[  5]   9.02-10.00  sec  43.2 MBytes   370 Mbits/sec    0   1.06 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   446 MBytes   374 Mbits/sec    0             sender
[  5]   0.00-10.01  sec   446 MBytes   374 Mbits/sec                  receiver

iperf Done.

Netgear X10 (R9000)

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 55070 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1.03 GBytes  8.85 Gbits/sec    0   1.31 MBytes       
[  5]   1.00-2.00   sec  1.13 GBytes  9.68 Gbits/sec    0   1.31 MBytes       
[  5]   2.00-3.00   sec  1.13 GBytes  9.69 Gbits/sec    0   1.31 MBytes       
[  5]   3.00-4.00   sec  1.09 GBytes  9.40 Gbits/sec    0   1.31 MBytes       
[  5]   4.00-5.00   sec  1.12 GBytes  9.66 Gbits/sec    0   1.31 MBytes       
[  5]   5.00-6.00   sec  1.13 GBytes  9.69 Gbits/sec    0   1.31 MBytes       
[  5]   6.00-7.00   sec  1.11 GBytes  9.56 Gbits/sec    0   1.31 MBytes       
[  5]   7.00-8.00   sec  1.12 GBytes  9.60 Gbits/sec    0   1.31 MBytes       
[  5]   8.00-9.00   sec  1.06 GBytes  9.09 Gbits/sec    0   1.31 MBytes       
[  5]   9.00-10.00  sec  1.13 GBytes  9.72 Gbits/sec    0   1.31 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  11.1 GBytes  9.49 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  11.1 GBytes  9.49 Gbits/sec                  receiver

iperf Done.

TP-Link EAP615-Wall v1 - OpenWrt 22.03.3

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  77.5 MBytes   650 Mbits/sec    0    895 KBytes       
[  5]   1.00-2.01   sec  81.2 MBytes   675 Mbits/sec    0    895 KBytes       
[  5]   2.01-3.00   sec  80.0 MBytes   676 Mbits/sec    0    895 KBytes       
[  5]   3.00-4.01   sec  82.5 MBytes   683 Mbits/sec    0    895 KBytes       
[  5]   4.01-5.01   sec  80.0 MBytes   677 Mbits/sec    0    895 KBytes       
[  5]   5.01-6.01   sec  81.2 MBytes   678 Mbits/sec    0    895 KBytes       
[  5]   6.01-7.00   sec  77.5 MBytes   656 Mbits/sec    0    895 KBytes       
[  5]   7.00-8.01   sec  80.0 MBytes   666 Mbits/sec    0    895 KBytes       
[  5]   8.01-9.01   sec  78.8 MBytes   659 Mbits/sec    0    895 KBytes       
[  5]   9.01-10.00  sec  78.8 MBytes   667 Mbits/sec    0    895 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   798 MBytes   669 Mbits/sec    0             sender
[  5]   0.00-10.00  sec   798 MBytes   669 Mbits/sec                  receiver

For some reason OpenWrt is considerably slower than Debian on RPi 4

Raspberry Pi 4 - OpenWrt 22.03.3

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   761 MBytes  6.38 Gbits/sec    0   1.12 MBytes       
[  5]   1.00-2.00   sec   750 MBytes  6.29 Gbits/sec    0   1.12 MBytes       
[  5]   2.00-3.00   sec   774 MBytes  6.50 Gbits/sec    0   1.12 MBytes       
[  5]   3.00-4.00   sec   775 MBytes  6.49 Gbits/sec    0   1.12 MBytes       
[  5]   4.00-5.00   sec   821 MBytes  6.90 Gbits/sec    0   1.12 MBytes       
[  5]   5.00-6.00   sec   758 MBytes  6.35 Gbits/sec    0   1.12 MBytes       
[  5]   6.00-7.00   sec   749 MBytes  6.29 Gbits/sec    0   1.12 MBytes       
[  5]   7.00-8.00   sec   796 MBytes  6.68 Gbits/sec    0   1.12 MBytes       
[  5]   8.00-9.00   sec   744 MBytes  6.24 Gbits/sec    0   1.12 MBytes       
[  5]   9.00-10.00  sec   748 MBytes  6.27 Gbits/sec    0   1.12 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  7.50 GBytes  6.44 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  7.49 GBytes  6.43 Gbits/sec                  receiver

Raspberry Pi 4 - Debian Bullseye

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1.12 GBytes  9.60 Gbits/sec    0   1.50 MBytes       
[  5]   1.00-2.00   sec  1.12 GBytes  9.64 Gbits/sec    0   1.50 MBytes       
[  5]   2.00-3.00   sec  1.13 GBytes  9.71 Gbits/sec    0   1.50 MBytes       
[  5]   3.00-4.00   sec  1.12 GBytes  9.62 Gbits/sec    0   1.50 MBytes       
[  5]   4.00-5.00   sec  1.12 GBytes  9.58 Gbits/sec    0   1.50 MBytes       
[  5]   5.00-6.00   sec  1.12 GBytes  9.59 Gbits/sec    0   1.50 MBytes       
[  5]   6.00-7.00   sec  1.11 GBytes  9.54 Gbits/sec    0   1.50 MBytes       
[  5]   7.00-8.00   sec  1.10 GBytes  9.46 Gbits/sec    0   1.50 MBytes       
[  5]   8.00-9.00   sec  1.06 GBytes  9.11 Gbits/sec    0   1.50 MBytes       
[  5]   9.00-10.00  sec  1.06 GBytes  9.08 Gbits/sec    0   1.50 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  11.1 GBytes  9.49 Gbits/sec    0             sender
[  5]   0.00-10.04  sec  11.1 GBytes  9.45 Gbits/sec                  receiver

Raspberry Pi 4 - Debian Bookworm

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1.41 GBytes  12.1 Gbits/sec    0   1.31 MBytes       
[  5]   1.00-2.00   sec  1.32 GBytes  11.4 Gbits/sec    0   1.31 MBytes       
[  5]   2.00-3.00   sec  1.46 GBytes  12.5 Gbits/sec    0   1.31 MBytes       
[  5]   3.00-4.00   sec  1.46 GBytes  12.5 Gbits/sec    0   1.31 MBytes       
[  5]   4.00-5.00   sec  1.44 GBytes  12.4 Gbits/sec    0   1.31 MBytes       
[  5]   5.00-6.00   sec  1.33 GBytes  11.4 Gbits/sec    0   1.31 MBytes       
[  5]   6.00-7.00   sec  1.55 GBytes  13.3 Gbits/sec    0   1.31 MBytes       
[  5]   7.00-8.00   sec  1.42 GBytes  12.2 Gbits/sec    0   1.31 MBytes       
[  5]   8.00-9.00   sec  1.40 GBytes  12.0 Gbits/sec    0   1.31 MBytes       
[  5]   9.00-10.00  sec  1.41 GBytes  12.1 Gbits/sec    0   1.31 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  14.2 GBytes  12.2 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  14.2 GBytes  12.2 Gbits/sec                  receiver

openwrt x86_64 custom build
OpenWrt SNAPSHOT, r22278-7dceef5ee5

Core i5-4690K@4.5Ghz
8gb@1800Mhz single channel ram

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 38452 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  9.01 GBytes  77.4 Gbits/sec    0   1.19 MBytes       
[  5]   1.00-2.00   sec  9.26 GBytes  79.5 Gbits/sec    0   1.19 MBytes       
[  5]   2.00-3.00   sec  9.25 GBytes  79.5 Gbits/sec    0   1.19 MBytes       
[  5]   3.00-4.00   sec  9.34 GBytes  80.2 Gbits/sec    0   1.19 MBytes       
[  5]   4.00-5.00   sec  9.34 GBytes  80.2 Gbits/sec    0   1.19 MBytes       
[  5]   5.00-6.00   sec  9.33 GBytes  80.1 Gbits/sec    0   1.19 MBytes       
[  5]   6.00-7.00   sec  9.34 GBytes  80.2 Gbits/sec    0   1.19 MBytes       
[  5]   7.00-8.00   sec  9.35 GBytes  80.3 Gbits/sec    0   1.19 MBytes       
[  5]   8.00-9.00   sec  9.31 GBytes  80.0 Gbits/sec    0   1.19 MBytes       
[  5]   9.00-10.00  sec  9.32 GBytes  80.1 Gbits/sec    0   1.19 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  92.8 GBytes  79.8 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  92.8 GBytes  79.8 Gbits/sec                  receiver

iperf Done.
root@OpenWrt:~# uname -a
Linux OpenWrt 5.15.98 #0 SMP Wed Mar 15 00:44:29 2023 x86_64 GNU/Linux

-----------------------------------------------------
 OpenWrt 22.03.3, r20028-43d71ad93e
 -----------------------------------------------------
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 42490 connected to 127.0.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  49.8 MBytes   417 Mbits/sec    0    639 KBytes
[  5]   1.00-2.00   sec  49.1 MBytes   413 Mbits/sec    0    639 KBytes
[  5]   2.00-3.00   sec  49.8 MBytes   417 Mbits/sec    0    639 KBytes
[  5]   3.00-4.00   sec  50.1 MBytes   421 Mbits/sec    0    639 KBytes
[  5]   4.00-5.00   sec  50.4 MBytes   423 Mbits/sec    0    639 KBytes
[  5]   5.00-6.00   sec  50.0 MBytes   420 Mbits/sec    0    639 KBytes
[  5]   6.00-7.00   sec  50.5 MBytes   423 Mbits/sec    0    639 KBytes
[  5]   7.00-8.00   sec  49.1 MBytes   412 Mbits/sec    0    639 KBytes
[  5]   8.00-9.00   sec  49.8 MBytes   418 Mbits/sec    0    639 KBytes
[  5]   9.00-10.00  sec  49.9 MBytes   419 Mbits/sec    0    639 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   499 MBytes   418 Mbits/sec    0             sender
[  5]   0.00-10.00  sec   498 MBytes   418 Mbits/sec                  receiver

iperf Done.
root@OpenWrt:~#

Xiaomi r4ac