I was backing up with Acronis from an EVO SSD and was only getting 42MB/s wite speeds. I used the USB-C to USB-C cable for this backup. Updated Acronis SW and same issue. Used the USB3.0 to USB-C connector on drive and I got good write speeds of 450+MB/s. So my problem was something between the USB-C to USB-C connection on my PC. Works fine with the other USB3.0 to USB-C cable.
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