High Dock CPU usage

I have an iMac which was acting very sluggish. The Dock was varying between 5 and 35% cpu usage - even with nothing but the activity monitor running.Also, the Windfowserver process had very similar usage patterns. I booted up with a safe start, and there was no difference. I then created a new administrative user account, and the problem went away on that account. However, I still would like to resolve the problem, and not just abandon my old user name and transfer everything over, as there is no reason to think the problem will not re-surface on the new account. Any insights into what may be causing this problem would be greatly appreciated.

That was a very interesting suggestion. I deleted both the plist and the DB file associated with the Dock, but there was no change in behavior when the default set was loaded by the OS.  I went back and forth between the two accounts to verify the behavior. On both accounts the Dock CPU usage cycles between a low CPU percentage and a high CPU percentage at about a 2 second interval. On the effected account the high usage varies between single and double digits, depending if the cursor is over the Dock. In the new account I get the same readings you do, with usage at 0.0, sometimes 0.3, but never breaking 1%.
All of the CPU percentages I am relating to you occur with only the AM active. I also tried turning  AirPort off, without any impact, and hiding the Dock, which also didn't change things - that one was a surprise.
I appreciate your insights. I don't know what else would be user specific that could cause this problem, and still welcome any suggestions or thoughts you may have.
Thanks

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    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    %CPU PID USER COMMAND
    6.0 428 root /usr/bin/Xorg.bin -br -novtswitch -quiet :0 vt7 -nolisten tcp -auth /var/run/xauth/A:0-biq1sc
    3.8 3690 ben /usr/lib/firefox/plugin-container /usr/lib/mozilla/plugins/libflashplayer.so -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 3231 plugin
    2.4 4910 ben /usr/bin/systemsettings -caption System Settings --icon preferences-system
    2.4 14853 ben clementine -t
    1.9 3231 ben /usr/bin/firefox
    Also, the screen doesn't have to be asleep, the system just needs to sit idle for a few minutes.
    Last edited by hippieben (2014-09-20 19:10:58)

  • Kernel_task high cpu usage when using external monitor at 1080p

    Specs
    Model Name:          MacBook Pro
      Model Identifier:          MacBookPro6,2
      Processor Name:          Intel Core i7
      Processor Speed:          2.66 GHz
      Number Of Processors:          1
      Total Number Of Cores:          2
      L2 Cache (per core):          256 KB
      L3 Cache:          4 MB
      Memory:          4 GB
      Processor Interconnect Speed:          4.8 GT/s
      Boot ROM Version:          MBP61.0057.B0C
      SMC Version (system):          1.58f15
    My external display is a Samsung PX2370 connected to my MBP using an HDMI cable with a HDMI-to-miniDP adapter
    I first noticed this after the last EFI update several months back. At first I thought kernel_task eats up too much cpu cycles whenever an external display is attached, but it turns out this only happens when the external display is set to 1080p. When external display is set to 720p, kernel_task is pretty much normal (~5% cpu usage) but rises up to ~150% cpu usage once the external display is set to 1080p.
    kernel_task cpu usage is also with normal range when my MBP is connected to a Samsung LCD TV at 720p.
    Anyone having the same problem or know of any fix/workarounds?

    Seems like the problem persists when playing a 720p video on the external display set to 720p. To sum it up
    Video Resolution
    Main Display
    External  (1280x720)
    External (1920x1080)
    480p
    ok
    fluctuating kernel_task cpu usage (~5 to ~150 cpu usage)
    high kernel_task cpu usage
    720p
    ok
    high kernel_task cpu usage
    high kernel_task cpu usage
    1080p
    ok
    high kernel_task cpu usage
    high kernel_task cpu usage

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