Speed up boot time and shutdown?

[SGS]

Can i disable NetworkManager-wait-online.service

Is there a reason to make it completely unusable (via mask) rather than just disabling it from starting on boot (via disable)? Oh, also to note, even though NetworkManager-wait-online might be taking a long time to start (especially if you have a wifi connection that starts only after you log in) it does not necessarily mean that it is delaying your boot process. You should also check systemd-analyze critical-chain