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As I see the progress bar on my MacBook Pro mid-2015 move from left to right, soon after it gets past the halfway point, it starts to slow down and eventually stops temporarily, at about the time the cursor appears. Then the spinning system cursor appears for about 3-5 seconds, and the boot sequence continues normally (and finishes).

How can I troubleshoot this? My wish would be to avoid a clean install and restore from scratch.

I previously reported the same problem under High Sierra.

  • did you try Verbose mode to see what it does ? – Ruskes Nov 6 '18 at 4:29
  • The last time I tried, the stall occurred after there was no more text output to the screen. – odysseus Nov 6 '18 at 11:39
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I'm pretty sure it's disk encryption (FileVault2) that is causing the delay. I had to erase my internal flash drive and restore from backup. In so doing, I reformatted the flash drive as normal APFS and not APFS encrypted. There was no delay in booting. After I enabled FileVault encryption (and it finished), the boot delay returned.

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