I want to reduce the boot time by disabling some systemd services but i dont know what to disable

Stopping the network manager service (placing it on manual) should help.

Plymouth-quit-wait is for the splash screen, instead of the list of functions your computer is performing on boot. The flashing z that expands to zorin right before the login screen...

You could also upgrade your hard drive to an ssd or nvme as well as increasing the amount of ram your system contains to the mb manufacturers limit.

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