I have installed Tumbleweed on a rather powerful machine (Dell Precision 5530).
The root file system is btrfs in an encrypted LVM container. The file system
performance has unfortunately greatly degraded and is starting to negatively
impact my workflow: just downloading a larger image over the internet (download
rate <= 12.5MB/s) causes the system load to go up by quite a bit and additional
writes to the file system take a noticeable amount of time to finish (e.g.
saving a text document takes a few seconds).

Unfortunately, I have absolutely no idea how to debug this issue. I used to
have compression enabled to save some space on the SSD, but turned it off
everywhere via chattr & a full defrag (but that did not really solve the
issue).

Any help would be greatly appreciated, as I don't really want to reinstall with
xfs or ext4 on /. This must be a software/configuration issue, as a colleague
has exactly the same machine with btrfs on / as well and never ran into any of
these issues.