NCM865 - Linux - Incredibly poor performance

[Ross Brown]

The NCM865 chipset suffers INCREDIBLY poor performance on Linux -
usually about 1/10th of what adaptors from other vendors are able to
achieve from the same AP and same machine, in the same location.

Fastfetch output:
             .',;::::;,'.                 crystalyne at ross-framework-13
         .';:cccccccccccc:;,.             ----------------------------
      .;cccccccccccccccccccccc;.          OS: Fedora Linux
42.20251014.0 (Silverblue) x86_64
    .:cccccccccccccccccccccccccc:.        Host: Laptop (AC)
  .;ccccccccccccc;.:dddl:.;ccccccc;.      Kernel: Linux 6.16.11-200.fc42.x86_64
 .:ccccccccccccc;OWMKOOXMWd;ccccccc:.     Uptime: 33 seconds
.:ccccccccccccc;KMMc;cc;xMMc;ccccccc:.    Packages: 1521 (rpm), 57 (flatpak)
,cccccccccccccc;MMM.;cc;;WW:;cccccccc,    Shell: bash 5.2.37
:cccccccccccccc;MMM.;cccccccccccccccc:    Display (NE135A1M-NY1):
2880x1920 @ 120 Hz (as 1440x960) in 14" [Built-in]
:ccccccc;oxOOOo;MMM000k.;cccccccccccc:    DE: GNOME 48.5
cccccc;0MMKxdd:;MMMkddc.;cccccccccccc;    WM: Mutter (Wayland)
ccccc;XMO';cccc;MMM.;cccccccccccccccc'    WM Theme: Adwaita
ccccc;MMo;ccccc;MMW.;ccccccccccccccc;     Theme: Adwaita [GTK2/3/4]
ccccc;0MNc.ccc.xMMd;ccccccccccccccc;      Icons: Adwaita [GTK2/3/4]
cccccc;dNMWXXXWM0:;cccccccccccccc:,       Font: Adwaita Sans (11pt) [GTK2/3/4]
cccccccc;.:odl:.;cccccccccccccc:,.        Cursor: Adwaita (24px)
ccccccccccccccccccccccccccccc:'.          Terminal: Ptyxis 48.5
:ccccccccccccccccccccccc:;,..             Terminal Font: Adwaita Mono (11pt)
 ':cccccccccccccccc::;,.                  CPU: 11th Gen Intel(R)
Core(TM) i7-1185G7 (8) @ 4.80 GHz
                                          GPU: Intel Iris Xe Graphics
@ 1.35 GHz [Integrated]
                                          Memory: 2.61 GiB / 15.40 GiB (17%)
                                          Swap: 0 B / 8.00 GiB (0%)
                                          Disk (/): 21.36 MiB / 21.36
MiB (100%) - overlay [Read-only]
                                          Disk (/etc): 34.72 GiB /
491.06 GiB (7%) - btrfs
                                          Local IP (wlp170s0): 192.168.8.191/24
                                          Battery (Framewo): 44% (56
mins remaining) [Discharging]
                                          Locale: en_GB.UTF-8

AP Used for speedtest: GL-iNet Spitz AX X3000 (Performance degradation
seen on all APs, not just this one)

NCM865 speedtest:
speedtest-cli
Retrieving speedtest.net configuration...
Testing from toob (145.40.178.183)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by YouFibre (London) [111.02 km]: 90.277 ms
Testing download
speed................................................................................
Download: 35.88 Mbit/s
Testing upload speed......................................................................................................
Upload: 64.41 Mbit/s

Intel AX210 speedtest:
speedtest-cli
Retrieving speedtest.net configuration...
Testing from toob (145.40.178.183)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by YouFibre (London) [111.02 km]: 8.698 ms
Testing download
speed................................................................................
Download: 551.98 Mbit/s
Testing upload speed......................................................................................................
Upload: 605.40 Mbit/s

Mediatek RZ616 speedtest:
speedtest-cli
Retrieving speedtest.net configuration...
Testing from toob (145.40.178.183)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by YouFibre (London) [111.02 km]: 8.932 ms
Testing download
speed................................................................................
Download: 582.44 Mbit/s
Testing upload speed......................................................................................................
Upload: 618.28 Mbit/s