My cloud home internal transfer unbearably slow

Yes, a USB 3.0 drive is a good alternative if one is available but you have to consider the amount of time it takes to copy the files to the USB drive in the first place. But it never hurts to have an extra copy of data on a backup USB drive. The MCH USB 3.0 is capable of 130 MB/s speed but could only be controlled from the Web or mobile app.