[Borgbackup] backup time more than doubled going from 1.1.13 to 1.4.0

[Thomas Waldmann]

What you can try to check whether it makes a difference:

If you don't need all the metadata borg is trying to collect by default, 
you can give the respective options to "borg create" to not collect / 
archive them: no acls, no xattrs, no (bsd)flags, ... - it will do less 
fs api calls then and that might speed up processing files.

It won't help if the open() is the primary cause though.

You could also run borg create and then use strace to attach to the 
running borg process and check the strace log timestamps to see how long 
fs operations take.