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In some cases, the Finder’s memory can rise irreversibly by hundreds of MB with a single search. The amount of memory leaked with each search varies, and appears to be related to the number of hits returned.

Each time that you type characters into its search box, triggering a search, Finder memory use will increase, but won’t return to normal even when that window is closed. To see this, open a new Finder window and convert it to Find using the Find command in the Finder’s File menu. It doesn’t affect normal Spotlight search, nor search using third-party Spotlight tools such as HoudahSpot or Find Any File (FAF). This memory leak occurs when using the Find command to search for files in Finder, and can become very large with repeated Find operations. I’m very grateful to fujimidai1 for telling me about it. It appears 100% reproducible on Intel and M1 models, and seems likely to be fixed in macOS 12.1. This leak has been reported to Apple by the Mozilla engineers who discovered it. Several users report that changing only the pointer size control, without setting a custom colour, is safe, and doesn’t result in any memory leak. No further memory leak from this cause should then occur. Once you have done that, quit all open apps and at least log out as the user.

Set the Pointer size there to Normal, and click on the Reset button to undo any colour customisation. The workaround is simple: open the Accessibility pane, select Display at the left, then the Pointer tab. This makes the leak hard to track, as it can and will effect any app with a human interface, from the App Store to Xcode. Leaked memory remains within that allocated to the app whose active window is underneath the pointer at the time that its type changes. This appears to be triggered specifically by the custom colour settings, but the size of the leak grows as the pointer size is increased. If you open the custom pointer controls in the Pointer tab of the Display item in the Accessibility pane, and set the pointer to be larger than normal using the Pointer size control, and set custom outline and fill colours, each time that your pointer changes type, such as from an arrow to an I-beam, the memory allocated for the previous type isn’t freed, but leaks. When that feature is turned off, it shouldn’t affect your Mac. This memory leak can rapidly become severe, but is only triggered by the use of a feature which is new to Monterey, colouring the pointer. My previous article provides a more detailed account of what memory leaks are.

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This article summarises them, and how to avoid becoming victim to them. Several informed me that there were others, and thanks to the investigative work of those readers, I can now describe a total of four, three of which I can reproduce here, and one which I can’t. Last week I published an article in which I explained what was then the prominent memory leak which had been demonstrated in macOS Monterey 12.0.1.

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