scrolling takes 15% processor power?

Discussion in 'MacBook Pro' started by ljx718, May 15, 2010.

  1. ljx718 macrumors 6502

    Joined:
    Dec 13, 2008
    #1
    hey, im here with a launch 17 in i7 500hdd and 4 gb ram.

    ive started to notice that the processor goes to 15% sometimes up to 20% while scrolling

    this is on any website, the nvidia gpu or intell, on battery or plugged in. its not flash either because i have click to flash installed.

    i just find it very odd that it needs that much processor just to scroll.

    anyone else noticing the same thing?
     
  2. dr. shdw macrumors 6502a

    Joined:
    Aug 27, 2008
    #2
    Yup I have the 2010 13" MBP 2.4ghz, scrolling in Chrome, no flash, etc, 50% :(
     
  3. RossMc macrumors 65816

    RossMc

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    Apr 30, 2010
    Location:
    Newcastle, UK
    #3
    Strange, Im using Safari and at the minute mine is around 3-5 %
     
  4. andrew086 macrumors regular

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    Dec 31, 2009
    #4
    wow... on firefox it uses 20%... goes from 4% idle to 24% scrolling w/ trackpad.
     
  5. sammich macrumors 601

    sammich

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    Location:
    Sarcasmville.
    #5
    You know, if you just scroll up and down really really fast, you can get 100% core usage.

    EDIT: ah right, that was in Chrome. In Safari, I get like 20-something%
     
  6. dr. shdw macrumors 6502a

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    Aug 27, 2008
  7. coolbreeze macrumors 68000

    coolbreeze

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  8. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
    #8
    scrolling as fast as i can with safari i get like 14% on my imac...

    what an odd bug.
     
  9. prism macrumors 6502a

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    Dec 6, 2006
    #9
    This is indeed crazy, no wonder I am not getting the advertised battery stamina!
     
  10. ljx718 thread starter macrumors 6502

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    Dec 13, 2008
    #10
    it could be it. i mean, why would it need so much processor. if it needs to render stuff, i though the gpu would do some of that.
     
  11. cluthz macrumors 68040

    cluthz

    Joined:
    Jun 15, 2004
    Location:
    Norway
    #11
    Due to the i5/i7 has 4 virtual cores, max cpu usage is 400%
    15-20% usage is 3.75-4% usage (overall), which seems normal
     
  12. ljx718 thread starter macrumors 6502

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    Dec 13, 2008
    #12
    coud explain it, but i have it so istat shows the 4 processors as one
     
  13. DoFoT9 macrumors P6

    DoFoT9

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    Jun 11, 2007
    Location:
    Singapore
    #13
    so the 15% is actually more like 75% on each core :O wowsicle! thats a TON!

    mine is using ~13% out of 800%!
     
  14. xlii macrumors 68000

    xlii

    Joined:
    Sep 19, 2006
    Location:
    Millis, Massachusetts
    #14
    I don't see it as a bug. I got the same results you did, but I'm scrolling up and down so fast to get that result that it's not how I scroll and the bump is only for a second. Scrolling normally as one would while reading a page results in a 1 to 2 percent increase in CPU usage and that is only while the scroll bar is being moved.
     
  15. ljx718 thread starter macrumors 6502

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    Dec 13, 2008
    #15
    i actually get it no matter how fast or slow i scroll
     
  16. sammich macrumors 601

    sammich

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    Sep 26, 2006
    Location:
    Sarcasmville.
    #16
    Lol, try this in Chrome: on any page, even this simple thread, scroll as slowly as you can (works easier on a trackpad, 2 fingered scroll), it has to be consistent. I'm scrolling at about 10 pixels/second up, and the CPU usage in Activity Monitor goes up to like 80% of one core. THAT's absolutely insane!

    And in Safari, doing the same thing, I get about 10% in Safari, and 10% in WindowServer. If I scroll as fast as I can up and down in Safari, I get to about 30% in Safari and the same in WindowServer.

    I think what xlii is trying to say is that you don't scroll for very long, and that it's just a momentary spike.

    Also, can I ask what you all think a reasonable %CPU usage for what may be a semi-complex (as a user it may not seem that difficult, hell the iOS does a good job) UI operation scrolling the page might be?
     
  17. cluthz macrumors 68040

    cluthz

    Joined:
    Jun 15, 2004
    Location:
    Norway
    #17
    I opened activity monitor and Safari peaks 25% with heavy scrolling on one core. It just doesn't seem right, I can at least not reproduce that CPU use on mine
     

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