I have the same problem… If I attach a WD passport drive to the Cloudserver, the speed is as expected.
For example… I copied a directory of 60meg of photos to both drives.
If I open the directory on the USB drive, thumbnails show straight away. On the built in drive, those thumbnails dont show for minutes. Surely the same network, same cable, same internal processor…
Also, video files from the built in drive buffer, and stutter… I am using a brand new 1g network switch, and a 1 gig network card on my PC. Laptops on wireless also struggle to access the main t terabyte drive.but performance improves from the USB drive, or any other share on my network.
All updates are installed