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

    Feb 12, 2008
    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


    Jan 26, 2008
    Isla Nublar
    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

    Feb 12, 2008
    Quicklook also use over 10% CPU.

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


  4. iThinkergoiMac macrumors 68030

    Jan 20, 2010
    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

    Jul 24, 2011
    Palo Alto, CA
    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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