rustam18

 cat /home/rusti/<dir_list>.txt | parallel --will-cite -j4 time rsync -ahrzp user@<source>:<source_dir> <dest_dir>
  
 The fastest remote directory rsync over ssh using GNU utility parallel which will run concurrent threads at the same time.

a: archive mode - rescursive, preserves owner, preserves permissions, preserves modification times, preserves group, copies symlinks as symlinks, preserves device files.
h: human-readable output numbers in a human-readable format
r: recursive
z: compress during transfer
p: progress
-will-cite -j4: four threads, it should not be more than the 1.5 * number of cpu chores you have on your system.