[Bug 1782535] [NEW] cifs - poor upload speed with nautilus compared to rsync

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I'm mounting folders from my NAS on my computer (Ubuntu 18.04) with
cifs. Copying an 8 GB file...

Upload (local -> mounted)
- Nautilus/Nemo -> 6 MB/s
- rsync -> 50-60 MB/s

Download performance is also strange, but not my biggest concern.
Download (mounted -> local)
- Nautilus/Nemo -> 90 MB/s
- rsync -> 50-60 MB/s

rsync command (upload):
rsync --progress /home/me/file.iso /mnt/cifs_media/

fstab entry:
//nas/media /mnt/cifs_media cifs vers=3.0,uid=me,gid=me,credentials=/home/me/.smbcredentials,dir_mode=0700,file_mode=0700 0 0

Any idea, why Nautilus is uploading up to 10 times more slowly than
rsync, although both using the same cifs, os, hardware, network etc.?

PS: Further info for bug report
1) The release of Ubuntu: Ubuntu 18.04 LTS
2) The version of the package: Nautilus 3.26.3
3) What you expected to happen: At least same speed as with using rsync
4) What happened instead: See above

** Affects: glib2.0 (Ubuntu)
     Importance: Low
         Status: New


** Tags: bionic
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cifs - poor upload speed with nautilus compared to rsync
https://bugs.launchpad.net/bugs/1782535
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