iMac constantly paging with lots of free RAM

stooovie

macrumors 6502a
Original poster
Nov 21, 2010
792
289
Hi, my 2015 5k iMac with 24 GB RAM is constantly swapping, like 20-70 MBps (according to iStat Menus). The whole thing is slow and beachballs often. The machine has 24 GB RAM and this starts happening very quickly after rebooting, when there's not a lot running.

Here's a typical example:



EtreCheckPro wasn't very helpful, and the usual maintenance dance (reboot, install combo, reinstall from Recovery, clear PRAM and SMP, run maintenance scripts, Disk First Aid...) didn't help.

Any tips? Thanks!
 

chabig

macrumors 603
Sep 6, 2002
6,034
3,272
Your memory use is normal.

https://support.apple.com/en-gb/HT201464
  • Swap Used: The space used on your startup drive by macOS memory management. It's normal to see some activity here. As long as memory pressure is not in the red state, macOS has memory resources available.
Also see this...Page Ins are normal. See post #6 here: https://macosx.com/threads/page-ins-and-page-outs-could-somebody-please-explain-this-to-me-in-idiot-fashion.47648/

As for being slow, does your 2015 Mac have a spinning hard drive? That’s probably the culprit. Replacing it with an SSD will make a night and day difference.
 
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stooovie

macrumors 6502a
Original poster
Nov 21, 2010
792
289
I beg to differ, constant Pageins of roughly 40 MBps are definitely not normal. Thanks anyway!

It seems it was caused by CloudMounter. I saw a huge number of its activity in Console, uninstalled, computer seems back to normal instantly.

EDIT: pageins like this ARE normal, I was wrong. Still, the rest stands.
 
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stooovie

macrumors 6502a
Original poster
Nov 21, 2010
792
289
Yes, it was wreaking crazy havoc on my Mac, including keyboard not registering some keypresses, insane slowness and instability of apps. It's probably a fairly low-level stuff plugged into filesystem and whatnot. With it gone and replaced with ExpanDrive, all is completely fine. I wouldn't expect that.