Since 5.10 kernel there is a new feature called fast_commit. In arch wiki https://wiki.archlinux.org/title/ext4 you can read that it can be enabled in existing filesystem with:
tune2fs -O fast_commit /dev/drivepartition
but in https://lwn.net/Articles/842385/ there is:
Fast commits are activated at filesystem creation time, so users will have to recreate their filesystems to use this feature.
So is tune2fs -O fast_commit truly enable this feature in existing filesystem ?
This needs a straight answer.
Edit: I stand corrected, this capability was added to tune2fs later. It creates the fast_commit journal just like "mke2fs -O fast_commit" would at creation time.
Check your filesystem features with "tune2fs -l /dev/whatever" and if fast commits are enabled, it will show up in the features line.