High CPU usage with video

Discussion in 'Mac Basics and Help' started by mike613ottawa, Feb 25, 2009.

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  1. mike613ottawa, Feb 25, 2009

    mike613ottawa macrumors newbie

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    Feb 25, 2009
    #1
    I've searched all over the internet but have yet to come across an answer. I love my Mac, but why is it that when I play a video in a web browser on my MacBook, (be it Flash, QuickTime, etc.) my CPU usage is anywhere from 60-80%, yet when I play the same video on a laptop running Windows, the CPU usage is always in the single digits?

    I realize that video takes a toll on the CPU with integrated video cards, but it doesn't seem to have the same effect on Windows based laptops with integrated video cards. Is the CPU usage possibly just calculated differently, or is the Mac architecture somehow just really inefficient at this?

    Thanks in advance,
    Mike.
     
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  2. BlueRevolution, Feb 26, 2009

    BlueRevolution macrumors 603

    BlueRevolution

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    #2
    Does it affect the speed of other applications? If not, I wouldn't worry about it.
     
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  3. mike613ottawa, Feb 26, 2009

    mike613ottawa thread starter macrumors newbie

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    #3
    Thanks for the reply! No, it doesn't affect any other applications. It would just appear to take a toll on battery life for obvious reasons. I like to try and keep my resources as low as possible for this reason... :)

    Mike.
     
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  4. aristobrat, Feb 26, 2009

    aristobrat macrumors G4

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    #4
    I've only noticed that with Flash videos. The community thought around here is that Adobe has done a crappy job of optimizing the Mac version of Flash.
     
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  5. hwmbrogden, Feb 26, 2009

    hwmbrogden macrumors member

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    #5
    I will be sure to stay away from flash videos then. Ahh man, I thought I was going to get away from video problems...
     
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  6. mike613ottawa, Feb 26, 2009

    mike613ottawa thread starter macrumors newbie

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    #6
    This seems to occur with pretty well all video formats, not just Flash.
     
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  7. Cave Man, Feb 26, 2009

    Cave Man macrumors 604

    Cave Man

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    #7
    It's because OS X uses the cpu for video decoding, while Windows uses the gpu for video decoding.
     
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  8. barkmonster, Feb 26, 2009

    barkmonster macrumors 68020

    barkmonster

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    #8
    Video on macs that isn't based on Quicktime or Realplayer has always being inferior to windows for some reason. On my fairly old mac, Flash runs choppy, especially those YouTube format videos commonly used for TV and Film trailers online.

    They're no more than h.263 video with 22Khz stereo aac audio but play back worse on my mac than anything double the resolution encoded as h.264 and 44.1khz Stereo AAC in Quicktime.

    I imagine on a decent mac like yours, it plays fine but the CPU usage you're seeing has something to do with the way OS X reports it.

    The Core 2 Duo is theoretically 4 cores in 1 because it uses Out of Order Execution to push more instructions through each clock cycle.

    Windows might simply be reporting the use of what it sees as 1 core, where as OS X may be showing overall CPU usage.

    Just a guess.
     
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  9. kastenbrust, Feb 26, 2009

    kastenbrust macrumors 68030

    kastenbrust

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    #9
    The actual problem is cased by Flash, on Mac's it causes the CPU to max out, even a stupid flash advert or youtube video will max out the CPU. Theres no solution for this unless Adobe decide to modify the way Flash runs on OS X. Its funny considering Flash was designed for Macs and it runs better on Windows.
     
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  10. mike613ottawa, Feb 26, 2009

    mike613ottawa thread starter macrumors newbie

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    Feb 25, 2009
    #10
    That is strange indeed! That would also explain why both Firefox and Safari use so many resources when I have several browser tabs/windows open at the same time, even when they are minimized. Safari does seem to handle minimized windows a little better though. I appreciate all the replies!

    Mike.
     
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