Transcend Ext HDD for Mac 2TB THUNDERDOLT

DD compact lightweight as many other brands. Performance V writing particularly disappointing. More than 7 hours to copy 566 GB so much longer than the same type of drive with just a USB 3 also has it, but for what use it on a Mac?
Live with unnecessary copying software.
I use CCC, Tri-Backup t, TechTool Pro 8 am and manic backups. I have 6 of my internal HDD plus 2 Time Mach.
In general, for good reason, a backup to HDD space (2TB) with Dock (USB 3) is much faster.