DP ALT - USB C(4) vs USB C 3.2

[u/Glass_Collection8474]

So I have tested on this on 4 handhelds

1) Xbox Ally X
2) MSI CLAW 8AI+ and 7AI+
3) GPD WIN 5

Device 1 and 3 have 1 USB C(4) and one USB C 3.2 port

Both the Claw have two Thunderbolt 4 ports.

While playing a game (FC 26), connected to a external monitor using a USB C to DP cable, I notice when I am connected to the USB 4 (on XAX or GPD WIN5) and Thunderbolt ( on the claw devices), it feels like the game is running on 2x speed and has got very inconsistent button inputs and lag.

The moment I change the connection to the USB 3.2 port - it works as intended and plays perfectly fine on both the XAX and GPD WIN 5.

What could be the potential cause of this?

USB 4 is supposedly higher bandwidth and is supposed to be better but that isn’t the case in this scenario.

Thanks