Since the btrfs master is in the thread → @andreas85
Do you know about the compression? Is there a way to set f.ex compress=zstd:10 as mount option when setting up the partitions in calamares?
Found this thread but the answer is “I don’t know if it is possible directly in calamares”. How to install manjaro with BTRFS file system, with zstd (2) compression in Calamares for UEFI?