Question concerning data transfer speed

My Cloud OS 3 Personal & Network Attached Storage My Cloud
4

You’re configuring speed and duplex manually.

That’s a TERRIBLE thing to do (unless you can do the same thing on your switch / router port being used.)

See Rule #1:

http://community.wd.com/t5/WD-My-Cloud/HOW-TO-Troubleshoot-NAS-Performance-concerns/m-p/618695#M1256