macOS 15.7 performance issues and app instability after update

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Level 1

14 points

macOS 15.7 performance issues and app instability after update

I have noticed that after updating my iMac 27 Kk computer with 32GB of RAM, it is throttling much more than before, even after indexing. Many of my apps are acting erratic and not responding as they did with macOS 15.6.1. A Perhaps another patch is needed for the 15.7 upgrade. I don't want to upgrade to Tahoe just yet, because there are still too many bugs, and I will wait until all those are worked out. Perhaps 3-4 months from now.

[Edited by Moderator]

Original Title: mac os 15.7

iMac 27″, macOS 15.7

Posted on Sep 18, 2025 12:36 PM

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Answer 1

Nov 7, 2025 2:15 AM in response to mac0z1a

Test in Safe Mode. Do you see the same problems? If not, then it is probably caused by some third party software not playing nice with the OS.

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Answer 2

Mac Jim ID

Level 9

57,356 points

Sep 18, 2025 12:49 PM in response to Barium1234

Do you have a question?

I don't have an iMac, but 2 MacBook Pros and one has 15.7 and I updated the other to Tahoe. In both cases there was minimal impact on lagging while opening apps for about a day and a a half. Since yesterday, everything has been back to normal.

Have you tried a Safe Boot to see if you are experiencing a conflict with a third party processes running on startup. Of course you can expect problems if you have installed Antivirus, Cleaners (such as CleanMyMac), or a VPN.

Start up your Mac in safe mode - Apple Support (CA)

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Answer 3

mac0z1a

Level 1

12 points

Nov 6, 2025 10:55 PM in response to Barium1234

I'm experiencing the same issue; my computer was excellent prior to updating to macOS Sequoia 15.7.2 as per the Adobe Suite recommendation, but I haven't been able to work for the past two days. The update made my computer very slow and causes my mouse to malfunction, crashes, launches other apps, and takes a long time to start. I tried everything, including updating my programs, deleting the files on my computer, and rebooting, but nothing helped. I don't advise anyone to update to macOS Sequoia 15.7.2 because I believe the software just wrecked my iMac.

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Answer 4

Sep 29, 2025 9:31 PM in response to Barium1234

I'm also experiencing the same, macbook pro m3 max with 36gb and, after 1 hour approx, it starts throttling with the mouse getting stuck... then I have to restart and sometimes even to unplug from the monitor and continue on laptop mode.

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