I did some performance testing om my XE75 mesh Network using a WLANPi connected to the 1Gig port on the primary XE75, running Librespeed and iPerf3(TCP/UDP).  Note - My XE75(AP mode) mesh network is running 1.2.9 and has approx. 39 clients attached across the primary and two satellites.  My internet pipe is also only approx. 140Mbps.

I used both 80MHz & 160MHz channels and 160MHz obviously provided the best results   I even almost managed to get 1Gbps download when using UDP.  There appears to be a lot of overhead involved using TCP but was pretty much pleased with the results?

I'm pretty sure WiFi6e would also improve the performance when I next upgrade my laptop?

(Testing)

Windows 11 laptop:

    Name                   : Wi-Fi
    Description            : Intel(R) Wi-Fi 6 AX200 160MHz
    GUID                   : c3b31042-7814-497a-b6f9-3c9d9b0e809f
    Physical address       : c0:3c:59:4e:a8:e0
    Interface type         : Primary
    State                  : connected
    SSID                   : Rubble
    BSSID                  : f2:fa:c4:1e:5a:a5
    Network type           : Infrastructure
    Radio type             : 802.11ax
    Authentication         : WPA2-Personal
    Cipher                 : CCMP
    Connection mode        : Profile
    Band                   : 5 GHz
    Channel                : 36
    Receive rate (Mbps)    : 1201(80MHz)2402(160MHz)
    Transmit rate (Mbps)   : 1201(80MHz)2402(160MHz)
    Signal                 : 99%
   

Performance results:

(80MHz channel)

Tool         (Primary XE75 D/U)    (Satellite XE75 D/U)

Librespeed     565Mbps/332Mbps        459Mbps/320Mbps
iPerf3(TCP)    520Mbps/400Mbps        311Mbps/238Mbps
iPerf3(UDP)    956Mbps/505Mbps        959Mbps/483Mbps

(160MHz channel)

Tool         (Primary XE75 D/U)    (Satellite XE75 D/U)

Librespeed     620Mbps/465Mbps        499Mbps/369Mbps
iPerf3(TCP)    714Mbps/716Mbps         320Mbps/264Mbps
iPerf3(UDP)    952Mbps/522Mbps        959Mbps/706Mbps