Why Does Activity Monitor Say Firefox is 100% CPU?

Discussion in 'Mac OS X Lion (10.7)' started by Fazzl, Aug 10, 2011.

  1. Fazzl macrumors 6502a

    Fazzl

    Joined:
    Aug 13, 2007
    #1
    Don't mind the not responding, it happens sometime with Firefox. But why does it list CPU at 100 or sometimes over 100%?

    [​IMG]
     
  2. Bunker macrumors member

    Joined:
    Oct 28, 2007
    #2
    Flash. Update your Flash player.

    Also update your Firefox to latest version 5.0.x.

    Best is to move to safari or Chrome when using Lion. :D
     
  3. Mackilroy macrumors 68040

    Mackilroy

    Joined:
    Jun 29, 2006
    #3
    Eh, Firefox 5 is also CPU-intensive. Ever since FF3 it's gone downhill in CPU usage.
     
  4. Benbikeman macrumors 6502a

    Benbikeman

    Joined:
    May 17, 2011
    Location:
    London, England
    #4
    It's definitely Flash player rather than Firefox itself. Visit a series of webpages with no flash at all (NB: most banner ads use Flash) and it's fine. Visit Flash-intensive sites and it goes crazy.

    I've reluctantly switched to Safari for now (which also has Flash issues, but copes better than FF).
     

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