Basically as Mike said, it does vary slightly year to year model to model, but luckily Mac OS in general is pretty well optimized out of the box.

The one basic rule is, if you are having problems running audio software, turn off anything you don't happen to be using at the time.
The biggest offender IMHO would be File Vault encryption, you should always have that turned off on a machine you plan on using for audio.

Other big offenders would be, bluetooth, wifi and networking via Firewire, you can turn anything that you don't absolutely need while running your audio software.

Here is a pretty good listing I found some time back, for various versions of OS X and how to turn off non-essential services for each version.
https://www.sweetwater.com/sweetcare/mac-pc-optimization/

Hopefully this helps.

EDIT: I almost forgot !
One more thing would be to make sure "app nap" is disabled for BIAB.
Select the BIAB app in the Finder, right click it and select "Get Info", you should make sure the box to disable "app nap" is checked .

- Jay

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Last edited by JayO; 09/04/18 11:03 AM.
MacPro 5,1/12 core@3.46GHz -- OS X 10.14.6 -- ATI 7970 -- 32 Gig RAM -- Crucial 500GB OS SSD -- Samsung EVO 1TB Audio/Sample SSD -- BIAB 2023 -- Logic Pro X -- Cubase Elements 11 -- Too many plugins