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is slow boot problem when trim is enabled still persist on Mojave?

I’m sorry, I’ve sold my MacBook Pro, now I own a MacBook 12”, boot is abt 14 seconds from apple logo to the login screen. No FileVault. I have 150 Gb free over 250. Bye!
 
With an external ssd on apfs my boot time is 5 minutes (4 minutes of that is a black screen before the apple logo), on sierra hfs its 15 seconds.
Have you gone to System Preferences and set your startup disk again? Sounds like the EFI loader is trying to find a different disk other than your external SSD.
 
Seems not. At least no problem on my Mac Pro

Could I ask what SSD you are using? I take it that you were getting a 15-20 second delay in High Sierra, but this went away with Mojave? I upgraded to Mojave recently and found the delay is still there. MP 5,1 with 1TB 850 EVO.

Some people have reported that restoring from a TM backup solved the problem. Do you (or anyone else) know if this is a permanent fix, or it just regresses after a few weeks? I'm happy to try this - I have an internal TM drive, so it wouldn't take that long - but won't bother if it's just a temporary fix.
 
Could I ask what SSD you are using? I take it that you were getting a 15-20 second delay in High Sierra, but this went away with Mojave? I upgraded to Mojave recently and found the delay is still there. MP 5,1 with 1TB 850 EVO.

Some people have reported that restoring from a TM backup solved the problem. Do you (or anyone else) know if this is a permanent fix, or it just regresses after a few weeks? I'm happy to try this - I have an internal TM drive, so it wouldn't take that long - but won't bother if it's just a temporary fix.

MX500 2TB via TempoSSD card.

I didn’t do anything, my last clean installation was back in 10.8. This Mojave upgraded from the High Sierra (which has this bug on my Mac).

So, if yours still has this issue. It seems the issue still there. Just randomly happen on different machines. And I don’t think there is any permanent fix yet.
 
Does this issue still persist in Mojave? I'm planning on buying a baseline iMac and installing a SSD inside.
 
Since an update to High Sierra in January my system has been pretty slow. Example, upon reboot it takes 20 seconds to display the password field after the background is displayed and after entering the password it takes 45 seconds to display my desktop. Everything I do involves a spinning wheel. There are pauses with everything, then the system will "catch up." But, for no particular reason, periodically it will run normally for about 3 hours then gradually become very slow again.

I have a mid-2012 Mac Pro. It's a 3.2 Ghz Quad Core Xenon processor, 32 Gb ram, 2 OWC SSD drives (250Gb for the OS/Applications; 500Gb for Customer files and 2 1TB spinning drives for backup). I have the default graphics card, ATI Radeon HD 5770.

I've reinstalled the OS - not a clean install but just a reinstall; no help. I have nothing running at Startup and have disabled all my background applications like Creative Cloud but I'm at a loss. I think I have tried every troubleshooting trick in the book. Any help would be appreciated.
 
I've reinstalled the OS - not a clean install but just a reinstall; no help. I have nothing running at Startup and have disabled all my background applications like Creative Cloud but I'm at a loss. I think I have tried every troubleshooting trick in the book. Any help would be appreciated.

Have you run etrecheck? Launchagents and daemons can slow things down, among other things.
 
Great post. Thanks Rheid, this worked for me. back on 17 sec's bootup time from pressing the button (from 45-50 sec's). One question though: Convert to APFS is greyed out in disktool. I didn't activate the file vault, is this the reason??
I have this issue and it continues on to my use of my Mac. It actually operates very slowly. I have SSD drives from OWC and 32Gb of RAM. One question, how do you handle updates from Apple? Will these, especially the Security Updates, either change for file system or be unable to install because they are looking for APFS?
 
I have moved on from this configuration. I bit the bullet and purchased a Metal graphics card and upgraded to Mojave - slowness solved.
 
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