For additional security and privacy I have also made a guide for setting up fully encrypted root filesystem and swap space: Please note that a fully encrypted root & swap space may require extra CPU

Indeed, an encrypted root fs and swap file will decrease performance as I pointed out at the end of the article. (i edited the article now to explain the performance cost at the beginning) It would be

Did you install sysvinit-core? After reboot the inittab file should be there, I forgot systemd init does not use the inittab (i should recommend to edit the inittab after reboot). After installing