Why am I experiencing "low" upload speed on PC

[Microsoft Windows]

When experiencing problems on my mobile (S10e) connection I started to research my internet speed (fibre 100/100):- my PC gives 91Mbps down and 18Mbps up on the NIC under Windows 11- on Wifi I get 70Mbps both ways- my PC gives 90Mbps both ways when running Ubuntu (hence it has to be windows ...)- I tried a load of suggestions (all available drivers, LSO-v2, Jumbo, etc).- PC-end of cable shows amber (100mb) while switch-side shows green (1GB)- I installed Speedtest on my HA which gives intermittent results :-(Any idea's / suggestions (could not uninstall latest Insider Preview)??Coen

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