With the My Cloud and its low powered hardware it may not make a difference. People have speed problems with external USB hard drives connected to the My Cloud’s USB port. There are quite a few threads, here are just a few:
https://community.wd.com/t/slow-usb-3-0-transfer-speeds-one-twentieth-expected-speed/143851
https://community.wd.com/t/external-hd-usb-3-0-very-slow-when-access-via-my-cloud/91919
https://community.wd.com/t/slow-transfer-speed-over-usb/91350
https://community.wd.com/t/ridiculously-slow-transfer-speed-between-my-cloud-usb-hdd/95257
