terrible performance of synch to this day

[Fred T. Hamster]

running the serene backer upper takes this long, even when everything is exactly identical already. or mostly so; maybe maildir updates while we're copying.
but this is ridiculous. it's because of our full checksummy slow bother of a way of doing things.

finished transfer from "/var/lib/mysql" to "/z/backup/var/lib/mysql"

real 23m36.593s
user 22m42.036s
sys 0m48.956s