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Why is my Mac Pro booting slow ?

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Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Sat Feb 02, 2019 11:34 am

My Mac Pro, High Sierra 10.13.6 is booting slower and slower, first attempt this morning, after about 15min, of extremely slow status bar below the apple logo, I re-started via the power button and it was quite a bit quicker, but much slower than it has been ordinarily.

What might this be, and how might I fix it ?
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Re: Why is my Mac Pro booting slow ?

Postby desmond » Sat Feb 02, 2019 2:15 pm

Drive problems? Hardware problems?

Do a disk check using disk utility...
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Re: Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Sat Feb 02, 2019 4:59 pm

Well, I closed down and then re-started, and the problem went away.

So that's that.

For now.
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Re: Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Thu Jun 06, 2019 5:33 pm

Problem is back again.

Ever slower status bar under the apple log when I boot.
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Re: Why is my Mac Pro booting slow ?

Postby desmond » Thu Jun 06, 2019 6:00 pm

Gone To Lunch wrote:Problem is back again.
Ever slower status bar under the apple log when I boot.

Every time, or just once? What happened when you tried the suggestions I already made above?
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Re: Why is my Mac Pro booting slow ?

Postby fruitcake » Thu Jun 06, 2019 9:49 pm

Check your console logs. Also try starting up in verbose mode. It can help tell where the boot up is hanging.
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Re: Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Sun Jun 16, 2019 11:07 pm

desmond wrote:
Gone To Lunch wrote:Problem is back again.
Ever slower status bar under the apple log when I boot.

Every time, or just once? What happened when you tried the suggestions I already made above?

My mac is bootable from two drives, System with 10.11.3, and Projects with 10.13.6 so I re-selected the boot drive from my preferences and that seemed to cure it for a while.

I have since booted from Projects so as to run the disk repair utility on System and that helped for a couple of boots, but it is now back again when I boot from the preferred System drive.

I have tried safe booting, and that stops it.
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Re: Why is my Mac Pro booting slow ?

Postby MOF » Mon Jun 17, 2019 12:40 am

Did you try First Aid in Disk Utility also is there at least 10% spare capacity on your boot drive?
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Re: Why is my Mac Pro booting slow ?

Postby Kwackman » Mon Jun 17, 2019 9:06 am

Gone To Lunch wrote:I have tried safe booting, and that stops it.
Consistently?
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Re: Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Mon Jun 17, 2019 9:15 pm

MOF wrote:Did you try First Aid in Disk Utility also is there at least 10% spare capacity on your boot drive?

Yes, and there is 50% spare capacity on that drive
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Re: Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Mon Jun 17, 2019 9:16 pm

Kwackman wrote:
Gone To Lunch wrote:I have tried safe booting, and that stops it.
Consistently?

Don't know, I only did it once, and running the repair utility seems to have done the trick.

And I also re-selected the drive from within the system preferences and that seems to clear it as well.
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Re: Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Tue Jun 25, 2019 2:14 pm

It happened again so this time I emptied the cache - for the first time - I have this mac for 3 years - and that got it back to normal.
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Re: Why is my Mac Pro booting slow ?

Postby MOF » Tue Jun 25, 2019 2:31 pm

It happened again so this time I emptied the cache - for the first time - I have this mac for 3 years - and that got it back to normal.
Which cache?
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Re: Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Tue Jun 25, 2019 11:27 pm

MOF wrote:
It happened again so this time I emptied the cache - for the first time - I have this mac for 3 years - and that got it back to normal.
Which cache?

Open Finder, select “Go”, click “Go to folder”, type “Library/Caches/”, delete all files, and empty trash.
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Re: Why is my Mac Pro booting slow ?

Postby MOF » Wed Jun 26, 2019 1:51 am

Open Finder, select “Go”, click “Go to folder”, type “Library/Caches/”, delete all files, and empty trash.
OK thanks, that sounds pretty comprehensive, I hope you didn’t throw some babies out with the bath water.
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Re: Why is my Mac Pro booting slow ?

Postby cyrano.mac » Wed Jun 26, 2019 5:19 pm

Gone To Lunch wrote:
MOF wrote:
It happened again so this time I emptied the cache - for the first time - I have this mac for 3 years - and that got it back to normal.
Which cache?

Open Finder, select “Go”, click “Go to folder”, type “Library/Caches/”, delete all files, and empty trash.

You might want to do a restart, right after deleting the caches, to give the system the opportunity to rebuild them. You'll notice the first restart taking a little longer.

Subsequent restarts should be back to normal speed.
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Re: Why is my Mac Pro booting slow ?

Postby Gone To Lunch » Thu Jun 27, 2019 12:20 am

cyrano.mac wrote:
Subsequent restarts should be back to normal speed.


Indeed they are.
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Re: Why is my Mac Pro booting slow ?

Postby Eddy Deegan » Thu Jun 27, 2019 1:44 am

Gone To Lunch wrote:It happened again so this time I emptied the cache - for the first time - I have this mac for 3 years - and that got it back to normal.

There is a bit of an irony there. Caches are obviously intended to enhance performance, and mos of the time they do, but when emptying a cache improves matters you know that someone, somwhere got something somewhat wrong.

It's attention to detail on that level that Steve Jobs was good at. Even though he didn't have much idea of how it worked under the hood he was a wizard at spotting and having someone fix things like this.

Not that it's easy to fix. To cite a quote that's been round for a few years now:
There are only two hard things in Computer Science: cache invalidation and naming things.

Glad it's working better for you now :thumbup:
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Re: Why is my Mac Pro booting slow ?

Postby cyrano.mac » Thu Jun 27, 2019 3:03 am

Speed isn't the obvious reason to have caches on macOS...

Reliability is. The way macOS is installed, the original binaries are only loaded and copied once, to the cache. From the second boot, the system starts from the cache. But it's on the same disk, so speed is about the same as a system without a cache.

If for whatever reason, binaries in the cache become corrupted, the system will replace them by making a new copy from the original.

MacOS also installs a lot of binaries that aren't needed for a particular configuration. These don't get copied to the cache. If the user connects something new later on, the needed binary will be added to the cache.

And /tmp isn't even the location of the cache itself. It does contain the config files for launchd. And these contain the list of files to load.

If you really want to delete all caches, you can use the Terminal, or a utility like Nothern' Softworks Cache Cleaner, or Onyx.
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