RT6600ax USB port only works at USB 2 speeds

Has anyone gotten any storage attached to the RT6600ax that works at faster than USB 2 speeds? I thought it was supposed to have a USB 3.1 GEN 2 10gbps port? I can't seem to make it go faster than USB 2 speeds.

So first I tried the drives plugged straight into the RT6600ax USB port:
The drives are:

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These drives mount up no problem. You can install threat prevention etc. with no problems. However, performance is lame.

They should read/write around...

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