I am transferring data from a backup to a 15" Macbook Pro mid-2012 (Non Retina). The backup is a clone of a drive of another MBP done on a 2.5" Hitachi Touro drive with a USB-3 interface. The drive in the 2012 MBB is a Fusion drive (250 GB SSD and 2 TB Firecuda drive from Seagate (5400 RPM)). The Fusion drive is encrypted with FileVault, and the 2012 MBP is running macOS Sierra. All this being said, the transfer rate I am getting is averaging at 8 MBytes/sec. Which appears to me to be very slow. According to reviews I read, USB-3 real life transfer rates and Firecuda drive write speed are both above 100 MB/sec. So where is the bottleneck? Is there a way to find out?
I must say that I am using a version of Carbon Copy Cloner that has not been validated on macOS Sierra. However, I also tried transferring my files with Migration Assistant and it was not any faster.