Welcome to the WD Community.
See if the following link helps.
http://community.wd.com/t5/WD-My-Cloud-EX4/download-and-upload-speed/m-p/660743/highlight/true#M593
Welcome to the WD Community.
See if the following link helps.
http://community.wd.com/t5/WD-My-Cloud-EX4/download-and-upload-speed/m-p/660743/highlight/true#M593