macOS 26 Tahoe: System runs out of application memory (M4 Pro, 48 GB RAM, 2 TB SSD)

Dear community,


I recently bought myself a MacBook Pro with a M4 Pro chip, 48 GB of RAM and a 2 TB SSD hard drive.

It shipped with macOS 15.


After updating to macOS 26 I've experienced the following issues:


1) "Black screen of death" after system sleep

2) After wake up from sleep, I get the message "System has run out of application memory" and the system is completely unresponsive. (Can't check Activity Monitor for details because of that)


I have never experienced these issues with other Macs, and I am on my third Apple silicon machine now. I used the migration assistant to migrate the machine from my former M2 Pro machine.


Could this be a OS issue or is my new hardware faulty?


I attached a screenshot of the "application memory" message, but is in German.


Thank you, best regards


Michael





[Edited by Moderator]

MacBook Pro 14″, macOS 26.0

Posted on Sep 30, 2025 1:02 AM

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Question marked as Top-ranking reply

Posted on Sep 30, 2025 6:39 AM

See if the problem is present when you boot in safe mode, which disables 3rd party extensions and performs some system cleanup.

 

Start up your Mac in safe mode - Apple Support


FWIW, I have your configuration (16" M4 Pro MBP, 48 GB memory, 2 TB SSD). I'm running 26.0.1 (from this morning) and upgraded to Tahoe when it launched, and I've had no issues.

88 replies

Nov 19, 2025 6:36 AM in response to cristiano106

cristiano106 wrote:

No, obviously no.
Please stop sending this messages out of the blue.

No one sent you this "out of the blue." When you post in a user-to-user technical support forum, people understandably think you want help. And the first step in giving you help is to ask clarifying questions. If you don't find the answers useful and you can't bring yourself to say "Thanks," just ignore them.

Nov 19, 2025 6:48 AM in response to IdrisSeabright

IdrisSeabright wrote:


cristiano106 wrote:

No, obviously no.
Please stop sending this messages out of the blue.
No one sent you this "out of the blue." When you post in a user-to-user technical support forum, people understandably think you want help. And the first step in giving you help is to ask clarifying questions. If you don't find the answers useful and you can't bring yourself to say "Thanks," just ignore them.

Are you being paid for writing this? It would really be a problem.

If I contribute to a thread saying "Hey, this happens also to" adding some details that triggered the problem in my case, I don't want that someone with ZERO knowledge about basic OS, asks me for irrelevant questions denoting his lack of basic knowledge, we aren't here to ask how to open a file in Finder.

And yes, to make it more clear if you ask someone that has just tell you:

With lot less of used memory percentage -> This problem happens

If you add: It could be your HD that's full, then you just demonstrate you know very very few about basic OS

Nov 19, 2025 6:55 AM in response to cristiano106

cristiano106 wrote:

Are you being paid for writing this? It would really be a problem.
If I contribute to a thread saying "Hey, this happens also to" adding some details that triggered the problem in my case, I don't want that someone with ZERO knowledge about basic OS, asks me for irrelevant questions denoting his lack of basic knowledge, we aren't here to ask how to open a file in Finder.
And yes, to make it more clear if you ask someone that has just tell you:
With lot less of used memory percentage -> This problem happens
If you add: It could be your HD that's full, then you just demonstrate you know very very few about basic OS

If you don't find the answers useful and you can't bring yourself to say "Thanks," just ignore them.

Nov 19, 2025 9:56 AM in response to cristiano106

cristiano106 wrote:


How much FREE space on your SYSTEM DRIVE?
It looks like your issue may be caused by a full drive rather than lack of available RAM.
No, obviously no.
Please stop sending this messages out of the blue.

You may think whatever you like.

I can assure you that most of the cases where the user "runs out of application memory" are NOT due to lack of memory, but of disk space. Maybe that is not your case, but since you mentioned only 20GB used out 36GB, it stands to reason that lack of memory was NOT the problem.


I think everyone in this thread hope that this issue will be handle as soon as possible by Apple engineers. Receiving responses like that just make me lose more time and it makes me questioning about the future of this OS, the more time pass the more it get unstable.

I do hope it gets resolved, but most people do not experience it, so maybe there is more to it than a "bug".

Nov 24, 2025 4:37 PM in response to Luis Sequeira1

Thank you for something legitimately helpful.


I have to say that I don't see exactly what you've described - can't "turn off" mail accounts, but can delete an account. I had four, and deleted them in Settings. Restarted, opened mail, and it's running (with no accounts) at 86 MB. I've re-added three, and it's running at a tranquil 180-250 MB range.


Two won't re-add, because Google is throwing a tantrum with them. That's a separate problem to solve.

macOS 26 Tahoe: System runs out of application memory (M4 Pro, 48 GB RAM, 2 TB SSD)

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