Hi,

>> Journalctl on btrfs was always this slow, some btrfsck were made on the file
>> system too, but I don't think it was corrupted. On just the first run it's
>> sluggish, after it's fast as the ext4 one.

Most likely the file is heavily fragmented due to COW.
Have you tried to manually defrag the filesystem and turn on autodefrag?

Regards, Clemens
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