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The SD card has a theoretical maximum of 50 MiB/s bandwidth, practically up to ~40 MiB/s which matches the reviews you see.
The USB3 ports serve up to ~400 MiB/s, so that should max out our WD easily. Of course assure that it's connected to one of the two USB3 ports instead of one of the two USB2 ports.
To check for related kernel logs/errors: