MacBook running hot due to System CPU usage?

Discussion in 'MacBook' started by maximus06, Jan 17, 2009.

  1. maximus06 macrumors regular

    Nov 5, 2007
    I've been monitoring the CPU temperatures on my 2 week old alu macbook frequently, and it always hovers at ~42 degrees celsius.

    However, today something odd happened, all of a sudden the computer was getting noticeable hotter (the fans remained off though), when I checked CPU temp it was up to 72 degrees.

    I checked with "Activity Monitor" and nothing was using up more than 2% CPU. Then I saw through iStatPro that system CPU usage was at 40%. What the hell? Its usually at 2-5%...i.e. always.

    After restarting, the system cpu usage was back down to 2% and the temperature slowly dropped back to its norm. Anyone have this happen?
  2. JamesGorman macrumors 65816


    Dec 31, 2008
  3. SOLLERBOY macrumors 6502a

    Aug 8, 2008
    I got this the other day, al;so get it with my imac, pretty sure it's just a conflict between the system and istat.
  4. hamzab macrumors 6502

    Oct 7, 2008
    Check how much activity usage WindowServer is using up?

    Do you happen to have a lot of Widgets installed? If so, maybe their causing it to heat up more

  5. maximus06 thread starter macrumors regular

    Nov 5, 2007
    Not that many widgets, maybe 3 extra ones. You don't get +32 degrees celsius from widgets.
  6. hamzab macrumors 6502

    Oct 7, 2008
    Belive me mate, I had this one Widget, it showed me fan speed, as in it actually showed how fast the fan was spinning, cant remember its name, I went on activities and saw that WindowServer was using something like 40% of CPU! I took off this widget and immediately saw a reduction in CPU usage which lead to drop in heat

    Just my 2 pence mate
  7. lr4life macrumors newbie

    Jun 17, 2008
    I have had the same problem.

    The same exact thing was happening to me.
    My computer was constantly extremely hot and my battery life had taken a noticeable hit.

    A quick check with my Activity Monitor and a glance at mt iStat menu bar tool revealed to me that something was running at almost FULL capacity while my computer simply sat with an iTunes and a Firefox window open.

    The culprit was iAntiVirus!
    It was using up to 98% of the processing power of one of my Intel cores.
    Why it felt the need to do so, is still a mystery to me, but since then my CPU usage has been back down to around 5% on each core for casual use.

    If you have iAntiVirus, then get rid of it ASAP.
  8. RiCEADDiCTBOY macrumors 6502a


    Dec 26, 2007
    memory leak? poor coding?

    programs can be system hogs...

Share This Page