Recently I had boot speed regression from 3.2 sec to 5.2 sec I tried to fstrim -v /, clean journal then decided to try btrfs commands.
Here’s what I did ( if your home is on a separate drive like mine you could change it to /home )
Taken from ARCH Wiki [https://wiki.archlinux.org/index.php/Btrfs]">[https://wiki.archlinux.org/index.php/Btrfs]
Defragmentation (Don’t do it on SSD! )
sudo btrfs filesystem defragment /
Scrub (Not sure if you can use it on SSD)
sudo btrfs scrub start /
sudo btrfs scrub status /
Balance (Not sure if you can use it on SSD)
sudo btrfs filesystem balance start /
sudo btrfs filesystem balance status /
and then all back to normal 3.2 sec
Hope it helps you too if your system becomes slow.
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