Note that the hard drive used on the My Cloud devices are NOT SSD drives as such there will always be a speed issue copying the data from/to an SSD drive from the My Cloud.
Second there are numerous reasons why copying data may be slower or faster for one person versus another or even on different computers on the same network.
One generally gets different copying speeds if copying one single large file versus a lot of small files.
Copying across the My Cloud’s USB port also is slow for most people.
One can use the forum search feature (magnifying glass icon upper right) to see there are lots of complaints, comments, discussion on copying speed on the WD My Cloud.
For starters see the following thread discussion as a starting point:
https://community.wd.com/t/before-you-rma-your-device-lets-talk-about-your-problems/136430
