Turning off Apple hardware checks on startup Since I stay on top of possible hardware errors using utilities, I don't want to allow my Mac to boot up and go through the checks each time.  How do I skip over this process each time the computer boots by using Terminal commands, and then how do I reinstate the default startup routines if I want to have a traditional boot?
You can’t bypass this.

It’s technically not an Apple limitation as all computers (PCs too) need to run a minimal set of tests to probe how much RAM is available, what boot devices are present, etc.   Without it, your Mac wouldn’t know from where to boot from at a very minimum