The NAS is running in my Apple environment for photos, music, and Time Machine backup. The read and write speeds are good average. As several reviewers complain about the low data throughput, I want the following - report observation - not explainable albeit for me: One uses for writing data on the NAS which provided surface "WD My Cloud", the copy operations in fact terribly slow. On the other hand to use the Finder to copy command, it suddenly goes very fast: the iPhoto library with 15,000 photos was transferred in just over an hour. Technical explanation I can Although no offer, but the effect is reproducible.