[Borgbackup] Speed issues compared with rsync

[Catscrash]

> How do I know if it's fast-skipping or not? mtime is not changed, ext4
> should have stable inode numbers. Nevertheless, I'm trying with the
> --ignore-inodes switch now and will let you know
Wow, -- ignore-inode did the trick

Archive fingerprint:
935e503e25900163a5ad922f890f590fc4a0f98272755673b671005d52340738
Time (start): Fri, 2017-04-14 17:08:44
Time (end):   Fri, 2017-04-14 17:13:29
Duration: 4 minutes 45.03 seconds
Number of files: 258616
------------------------------------------------------------------------------
                       Original size      Compressed size   
Deduplicated size
This archive:              335.34 GB            335.34 GB            
30.75 MB
All archives:                1.01 TB              1.01 TB           
304.52 GB

                       Unique chunks         Total chunks
Chunk index:                  311916              1117275
------------------------------------------------------------------------------
Ende der Sicherung Fri Apr 14 17:13:55 CEST 2017. Dauer: 317 Sekunden

Do you have an idea for a reason for this? I thought ext4 has stable
inodes? Is there a disadvantage to the ignore-inode switch?

best regards