so I removed the bcache LUKS device thing from the equation:
I commented it out the relevant line for home in /etc/crypttab and /etc/fstab
to use a dummy empty folder for /home on the main root SSD partition
and rebooted
and this still happens, this time it is
$ systemd-analyze blame|head -5
32.510s systemd-udev-settle.service
31.394s
dev-disk-by\x2duuid-xxxxxxx\x2xxxxx\x2xxxx\x2xxxx\x2xxxxxxxxxdevice
30.908s systemd-fsck-root.service
7.616s plymouth-quit-wait.service
7.195s NetworkManager-wait-online.service
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https://bugs.launchpad.net/bugs/1439445
Title:
systemd-fsck laps 30s on boot for /dev/mapper/home
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