High Sierra Very Slow Boot

Thanks for the tip. Disabling TRIM made a significant improvement in my boot time.

My 11" Macbook Air 4,1 with an aftermarket 240 GB OWC Aura SSD used to boot in 12 seconds in Sierra. After upgrading to High Sierra (from initial public release up to v 10.13) it was taking just over 2 minutes. I checked and found that trim was enabled so used the Terminal Command "sudo trimforce disable" and rebooted. I then verified TRIM was disabled in System Information then rebooted once more and the boot timed at 22 seconds.

I'm not sure if I had TRIM enabled before the upgrade to High Sierra but turning it now off certainly gives me a more reasonable boot time. I believe High Sierra makes a higher demand on resources and since my Macbook Air is has only 4 GB or Ram that may be the cause for the increase from 12 to 22 seconds. I can and guess, will have to live with TRIM Disabled and a slightly longer boot time.

Currently checking to see if OWC says I can run the Aura SSD without TRIM but believe it can.

You have Clean My Mac3 in the Launch Daemons. You need to get rid of it ... it is evil and slows down machines wickedly.

Otherwise your computer looks in good condition and you should notice the difference by getting rid of CMMac. Running Malwarebytes should do the job, otherwise you will need to get the uninstaller.

Come back and tell me what happened.

This worked for me.

Solution and fix for Slow Boot and Login to macOS High Sierra

1. Go to System Preferences

2. Select Startup Disk

3. Click Lock to Unlock and enter Admin password

4. Click and select and highlight Macintosh HD

5. Click Lock to Lock back setting

5. Close System Preferences window

6. Upon reboot you should see that the boot and login to macOS High Sierra is faster again, just like in macOS Sierra and earlier!

Enjoy

Very helpful thread: disabling TRIM on my Corsair Force solved the problem!

Thanks!!

edmac17 wrote:

the boot delay still the same.

There have been some reports of TRIM on 3rd party SSD not playing nice with boot up times. Easy enough to test.

Re: Mac Book Pro slow to boot after installing High Sierra

seventy one wrote:

you should notice the difference by getting rid of CMMac. Running Malwarebytes should do the job

Actually, Malwarebytes will not remove CleanMyMac. I agree with you that it should be removed, as so-called "cleaning" tools are not needed - and are actually counter-productive - on Macs. However, thus far I've never seen CleanMyMac involved in any other kind of bad behavior, and just being a cleaning tool isn't sufficient for detection by Malwarebytes.

Hi,

I have the same boot delay problem after updating to High Sierra. If I boot in verbose mode (holding Command-V when starting the computer), I can see the boot process seems to stall at the following line:

"apfs_mount_update:17785: er: mount check: ro->rw update: no encryption rolling in progress, bailing."

There is a delay of about 45 seconds, after which the boot process seems to continue normally.

I've tried booting into safe mode and selecting the system disc as in MacGallants instructions, with no effect.

You could try a Safe Mode boot, holding the Shift key at the chime. This forces the startup caches to reload, which takes a while, but might improve things after the next restart.

I have received a reply from OWC who said "You do not need to use trim with your Aura SSD."

So that means setting TRIM to disabled in High Sierra has solved my slow boot time.

you have to backup your mac then format it and get a clean install of high sierra this will fix your problem

Besides trying the "trim disable" fix according to the Apple Developer Forum mentioned into my previous post, I suggest also that if you have an Apple Developer account then you could submit a "bug report" , because it seems that a lot of people are experiencing this trouble and Apple teams should pay attention and provide a fix. The bug report is located here : https://bugreport.apple.com/web/.

Look forward for any comments / replies on this issue.

Best regards,

iainfromvictoria wrote:

Thanks for the tip. Disabling TRIM made a significant improvement in my boot time.

My 11" Macbook Air 4,1 with an aftermarket 240 GB OWC Aura SSD

Currently checking to see if OWC says I can run the Aura SSD without TRIM but believe it can.

Might be worth talking to OWC Support :

A Note on High Sierra Compatibility with Third Party SSDs | Other World Computing Blog

There are some good tips throughout this thread but yours may not be the same problem at all. I suggest you start a new thread which will mean the initial answers at least, will be exclusively yours. I further suggest you open the thread without a reference to this one, spell out your problems and the machine details and include an etrecheck report in full.

https://etrecheck.com/

Perhaps you could download and apply this program, designed by one of our senior contributors here. Publish the report as a reply to my post. It is safe to do so.

https://etrecheck.com/

You may be asked to click on an updated version.

edmac17 wrote:

Disabling TRIM makes no difference for my MB-Pro.

BTW: it has its original Hard Disk since I purchase it.

Regards,

No surprise there edmac17, HDD does not support TRIM.

TRIM command enables the SSD’s GC (garbage collection) to skip the invalid data rather than moving it, thus saving time not rewriting the invalid data. This results in a reduction of the number of erase cycles on the flash memory and enables higher performance during writes. The SSD doesn’t need to immediately delete or garbage collect these locations it just marks them as no longer valid. This helps ensure that all storage cells are aged uniformly and maximum lifetime achieved.