macOS Sequoia Massive memory leak

So this seems to be an issue with all the recent macOS versions, the windowserver process just seems to eat more and more ram. Now when im running a single safari window with 5 tabs, mail, messages, notes, and onenote, the windowserver process i guess needs 5gb of ram to do its job. I rebooted, it started at 250mb, as soon as i start opening things it skyrockets. It seems to eat about 1gb per app window open. Closing the apps does not lower the processes ram usage. It will continue to grow with every app i open. I did a fresh reinstall of the OS, reinstalled all 3rd party apps by hand, of which i only use a few, and the issue persists. These numbers hold true on my m3 MBA with 16gb ram and my partners m1 base MBA. This is ridiculous Apple

Posted on Sep 19, 2024 4:38 PM

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Posted on Oct 7, 2024 6:40 PM

Same issue here. And I believe this is related to iPhone Mirroring App.


I tried to keep away from that for 2 days, then the memory usage is acceptable even I connected to two 4k external displays (3 displays if internal included).


But when I accidentally clicked on the iPhone notification on my Mac this morning, the memory usage of window server went up instantly and keeps growing. Also that usage never decrease since then.


I am using macOS 18.0.1 on M1max MacBook Pro, so I deeply believe the memory leak problem is still not fixed.

65 replies

Oct 13, 2024 5:12 AM in response to jessatd75

I'm no expert so this pennyworth might not be worth a penny but it is how I understand it:


Random Access Memory is memory instantly available for open programmes to use so having 8gb RAM and not using it all could be said to be a waste. I don't think that using it fills up the machine's "installed memory" where your photos and documents and apps are stored and, when you switch an app off, the RAM it was using becomes available for other tasks. The newer apps use more RAM because they do more but when they are not used they don't occupy the RAM memory space. I paid £400 extra to double the RAM on this M1 machine to 16gb and the money will have been wasted if it is not needed. If we notice a performance problem due to high RAM usage it might be time to upgrade to a more modern machine. Multi-tasking with a lot of open apps is a great idea but can our brains really cope with all that?

Oct 14, 2024 10:55 AM in response to ahenk

I am astounded by the size of your Mail programme. Mine is:

I delete most communications except Family and Friends and my health, insurance, taxes and other personal business.

Are you the BBC or Microsoft or a spam factory? I am awed by the immense hoard of mail you have.

Perhaps you could move your historic, archival, emails to an external hard disk if you feel unable to bin them and that might free up more space for current work.

Oct 18, 2024 8:54 AM in response to jessatd75

I have had two system crashes in the last week, previously, flawless performance. I see in the crashlog that process parralalsM was faulting out - I ran all app updates available, restarted the VM fresh, left the machine overnight with my regular open apps. This morning it was responsive again, but after a while the system initiated a process manager window I've never seen before stating system memory is full. In the list of processes (mostly in the 100s of Mbs usage), Firefox was at 57Gb. Clearly, closed Firefox, and system is still running. I'll report to Mozilla and Apple in case there is an issue there.

Nov 16, 2024 7:22 AM in response to jessatd75

So I had version 15.0 and everything was great. I'm now getting the problem after installing version 15.1. As someone here said, the problem is the OS in relation to USB-C and\or HDMI monitor connections. It's not one specific app. My particular problem is with the screensaver. My Citrix workspace App also but all that is irrelevant. I trying to figure out how to downgrade back to 15.0. No luck so far. Apple support said I would have to go back to Sonoma. Anyone found a solution yet?

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macOS Sequoia Massive memory leak

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