Why has mp3 so high CPU usage under OS X?

Discussion in 'macOS' started by monstar-x, Apr 24, 2011.

  1. monstar-x macrumors member

    Joined:
    Feb 12, 2008
    #1
    Why has mp3 so high CPU usage under OS X?
    If i run a mp3 Stream or mp3 File, OS X use allways 10-12% CPU Load.
    Under Windows and Linux just 1-2%.
    Why is this so?


    OS X Snow Leopard 10.6.7
    - VLC, iTunes, VOX, mplayer commandline
     
  2. chrono1081 macrumors 604

    chrono1081

    Joined:
    Jan 26, 2008
    Location:
    Isla Nublar
    #2
    It doesn't. Your looking at a program that is running the mp3. Play the mp3 in quicklook and it won't even be a single percent.
     
  3. monstar-x, Apr 24, 2011
    Last edited: Apr 24, 2011

    monstar-x thread starter macrumors member

    Joined:
    Feb 12, 2008
    #3
    Quicklook also use over 10% CPU.

    0.1% when i dont play mp3 via Quicklook.
    12.6% when i play mp3 via Quicklook.


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  4. iThinkergoiMac macrumors 68030

    Joined:
    Jan 20, 2010
    Location:
    Terra
    #4
    No measurable difference on my computer, whether playing an MP3 or not. There's a brief spike as it opens, but that's not unusual.
     
  5. ShadowofBob macrumors newbie

    Joined:
    Jul 24, 2011
    Location:
    Palo Alto, CA
    #5
    Bumping an old thread because in Lion(this may have happened in Snow Leopard as well, but I never had activity monitor open to verify this) my CPU usage jumps from 0.5% to ~25% when using quicklook on an icon to preview an mp3. If I press spacebar to make it preview in a quicklook window, not just pressing play on the icon, the usage goes to a more tolerable 2-3%

    Anyone else have this issue?
     

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