NVME USB drives Realtek RTL9210/RTL9220 Firmware Version 1.xx

The usb port is Type-C 3.2 Gen1

3.2 Gen1 is 5Gbit, some mainboard makers go cheap and wire Type-C ports to 5Gbit for cost cutting. A nice example are those cheap A620 Chipsets which have the option for 10Gbit both from CPU and Chipset.
I recently got a M2 SATA cheap 512GB SSD to test my Unionsine MD202 case cause I had only trouble getting my SM2263XT drive to work with it. For some reason that Intenso NVME SSD ain't playing well with anything. The MD202 works just fine with the other NVME I have around (RTS5765).

to be sure to be in USB 3.2, check with the Chipgenius utility below

the 500 Mbps instead of 1000Mbps and a speed problem due to the port or the cable as said by Alien Invader
The firmware can also but already check the port then the cable (USB-C port)   

 

 

or via the update utility (Super plus)

 

 

try to set Windows Power saving settings to High