I did a fresh reinstall with btrfs now.
I experience the same extremly long shutdown times and even bootup times of my vault.
The overall system experience feels more snappy and interactive with btrfs (strange) than with default partitions/formatting.
I ended up with 5-7 seconds shutdown times then.
Now with btrfs it feels as if all 800GB are being written for the revision and it takes 10-20 minutes and the system is unresponsive/not usable at that time.
I will keep testing if it swings to 5-7s as with default installation, and will keep testing with revisions=0.
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