"Another way to reduce the delays is by disabling System Integrity Protection."
Definitely agree on this one here - I've noticed a big speed improvement when disabling SIP debugging with "csrutil enable --without debug" while in recovery mode.
I should note that the main reason I disable SIP isn't for speed, but to install the yabai window manager to make Aqua far more useful as a developer. I wrote a recent blog post on this, actually (https://triosdevelopers.com/jason.eckert/blog/Entries/2020/5...).
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