Improving USB tethering speed?

Hello, I have a shiny new 5G connexion which I intend to use as a complement to my bad home internet.

I see very different speeds depending on the method, using speedtest.net:

• Directly from the phone: ~200Mbps
• From the PC, using the native USB internet sharing feature: slow ramp up to ~30Mbps
• From the PC, using "PdaNet" in USB debug mode: slow ramp up to ~200Mbps

I don't understand why the native method would be slower, a lot of people on the internet mention that ISPs tend to throttle tethering, but PdaNet has a feature to hide the tethering and I get the nice speed without using this feature. The PdaNet approach is a more cumbersome with specific applications both on the PC and the phone. Anyone knows of a method to improve the native USB internet sharing?

• Phone: Fairphone 4
• Android 12
• ISP: Sosh (subsidiary of Orange, France)
• PC: Windows 10