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Slow Thunderbolt port

HP Recommended
HP Omen 17-an124cl
Microsoft Windows 10 (64-bit)

I have a two+ year old HP Omen 17-an124cl, product no. 4SY16UA#ABA.  Specs say it has a Thunderbolt 3 USB-C and 3 USB 3.1 ports.  I expected the Thunderbolt port to be at least as fast as the USB 3.1 ports, however, tests copying a large file (40GB) to a Sandisk Extreme SSD indicate the Thunderbolt operates at about one tenth (40 MB/s) the speed of the USB 3.1 ports (355 MB/s)!  What would cause this?

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