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Finder to 100% CPU

13725 Views 12 Replies Latest reply: Oct 3, 2013 11:24 AM by OisinDSNT RSS
topping Level 1 Level 1 (0 points)
Currently Being Moderated
Dec 20, 2010 5:16 PM
Hi all,

I saw someone with this issue, but his solution doesn't seem related to mine. Like most users, I open Finder windows and they stay open when I launch a foreground app. Problem is, sometimes Finder goes to 100% CPU after a while until the windows are closed.

It's very strange. My first instinct was it was Spotlight, but now it happens relatively frequently (once a day or so). MenuMeters shows high CPU usage, Activity Monitor confirms it is Finder at 100%, switch to Finder, hit "command option w", problem stops.

Is there a way to stop this altogether?

Cheers, Brian Topping
MBP 15" i7 hi-res 8GB/256GB SSD, iMac 27" Quad i7, Mac OS X (10.6.5)
  • Kappy Level 10 Level 10 (221,015 points)
    Currently Being Moderated
    Dec 20, 2010 6:39 PM (in response to topping)
    Yes, find out what is causing the Finder to malfunction. Killing a window only covers the symptoms, but it does not fix the problem.

    A first guess is: bad file in /Home/Library/Preferences/. Delete the file.
    Mac Pro 2.66 Ghz; MBP Unibody; MBP C2D 2.33 Ghz; 11" MBA, Mac OS X (10.6.4), iMac C2D 17"; MB 2.0 Ghz; iPad 32G; 80GB iPod Video; iPod Touch; iPod Nano 2GB
  • Martin Bell Level 1 Level 1 (120 points)
    Currently Being Moderated
    Jan 14, 2011 2:41 PM (in response to Kappy)
    Thanks Kappy, I had similar problem, deleting the file resolved the issue. For the time being anyway. May the Force be with you.
    iMac intel 2.4, MacBook Pro, Macbook, Mac OS X (10.6.4), .me
  • ichaddy Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jan 19, 2011 2:04 AM (in response to Kappy)
    Brilliant thanks so much. Works fine now even after a restart.

    I deleted the file ""

    in /Home/Library/Preferences/

    Goto Terminal and input
    killall Finder
    (this restarts the finder)

    Thats will bring the Finder back to 1%CPU usage !
    iPhone OS 3.0
  • woondidu Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jan 23, 2011 5:52 AM (in response to ichaddy)
    hi all

    I have the same problem. As soon as a finder window is open my cpu usage goes up to 100% - when I close all finder windows - problem gone.

    deleting the file and restarting the finder didn't change anything however...

    does anyone have another idea?
    Macbook 2006, Mac OS X (10.6.6)
  • rstoner Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jan 27, 2011 11:50 AM (in response to topping)
    I had the same problem this morning. Removing the plist file seems to have done the trick. Thanks.

    woondidu - If you have a lot of files, especially jpegs on your desktop, clean your desktop up this has also been known to cause finder to chew up CPU.
    MB PRO, Mac OS X (10.5.4)
  • rstoner Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jan 28, 2011 6:25 AM (in response to topping)
    AH this problem showed up again this morning and based on my playing around, I think Finder was choking on my external USB drive. I ran disk repair and there were several errors reported and repaired. Been running nice and quite for several hours now.
    MB PRO, Mac OS X (10.6)
  • bytemonkey Level 1 Level 1 (0 points)
    Currently Being Moderated
    Feb 20, 2011 2:48 AM (in response to Kappy)
    This did the trick for me just now. Moved the file to the trash, relaunched the Finder and everything immediately starting winding down.
    17" MBP 2.33Ghz C2D 3GB, Mac OS X (10.6.6)
  • snowyogi Level 1 Level 1 (0 points)
    Currently Being Moderated
    Mar 13, 2011 11:43 AM (in response to rstoner)
    Deleting all the screen captures on the desktop worked for me. CPU was about 85% and disk read was about 5MB/sec. Deleting about 30 png files immediately resolved the problem without reboot.
    Macbook pro late 2009
  • Phil.H Level 1 Level 1 (0 points)
    Currently Being Moderated
    Mar 22, 2011 10:27 AM (in response to snowyogi)
    As of 10.6.6 I have a version of this problem, completely reproducible,
    tied to checking the "calculate all sizes" in the "Show View options"
    Closing the Finder window thus checked, or unchecking the box restores
    the conventional Finder usage (0-0.4%) on an Intel Core i7 2.2 GHz 4-core.

    Previously reported around 10.6.2. in Sept. 2009

    I have a SSD disk that quickly calculates the sizes, but the Finder remains
    at 100% for one processor core, no matter how long the Finder window
    so checked (calculate all sizes). The window calculations are clearly done.

    In my case removing the preference file ( had no effect.

    It is hard to imagine this bug lingering until 10.6.6, unless the "tickle"
    is rather subtle.

    Quite reproducible. No time today to progressively delete preference files.
    MacBook Pro, Mac OS X (10.6.6), 128 GB SSD
  • KTransue Level 1 Level 1 (0 points)
    Currently Being Moderated
    Apr 1, 2011 8:02 AM (in response to Phil.H)
    Thanks Phil.H. I like having "calculate all sizes" set, especially since my MacBook Pro is using just about all available space. But, unchecking "calculate all sizes" restored typical cpu usage instantly.
    MacBook Pro, iMac, Mac Mini, Mac OS X (10.6.6)
  • mjc Level 3 Level 3 (635 points)
    Currently Being Moderated
    Aug 15, 2013 3:26 PM (in response to topping)

    I solved this issue by setting my finder preferences for "New Finder window show:"  to my home folder... My issue was that it was defaulting to "All My Files"--- that caused finder to scan everything, images, thumbnails, etc and get up over 100% of cpu usage.

  • OisinDSNT Level 1 Level 1 (0 points)
    Currently Being Moderated
    Oct 3, 2013 11:24 AM (in response to mjc)

    This worked for me! Cheers


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