Mac running hot with low cpu

Discussion in 'MacBook Air' started by newhere123, Jun 14, 2015.

  1. newhere123 macrumors newbie

    Jun 14, 2015
    Since around 2 weeks my Macbook Air 2013 sometimes heats up without any reason and runs slowly and sometimes freezes. Right now its running well but is there a reason why this could happen, it did not before and I didn't install anything new...Maybe something wrong with the fan?
    I once used too much CPU which caused the Mac to crash, this was around the time the problem started...or is this just a coincidence? My internet runs slow too sometimes. Or is it a Malware/Spyware? And is there a way to test if my Battery/Cpu is damaged?
  2. motrek macrumors 68020

    Sep 14, 2012
    What does Activity Monitor say about your CPU usage?

    Also you can download a program called smcFanControl which will give you a nice display of your system temperature and fan speed, which will be more data that might help diagnose the problem.
  3. MacBoook160 macrumors 6502

    Feb 9, 2011
    motrek, I downloaded this program, and it crashed my computer (also didn't allow me to erase it easily.) Chrome is much slower now. Granted, I'm on an MBP 2011 not a MBA, but I'm not sure what I did wrong. Not that you specifically have to answer me ;-) just curious if you or anyone else has had this issue. Still trying to make sure the program is completely off my machine.
  4. motrek macrumors 68020

    Sep 14, 2012
    Sorry you had a bad experience with the program. I've been using it for years and never had that happen to me on any of my Macs.

    Regardless of whether or not you have it installed, uninstalled, or partially uninstalled, it should have no effect on Chrome's performance.

    Maybe try installing it again and see if you can't get it to work this time? Reboot, etc.?

    Also, did you check Activity Monitor?
  5. MacBoook160 macrumors 6502

    Feb 9, 2011
    It's the darn Chrome - not just the application, but so many "Google Chrome Helpers." Granted, I keep more than my share of tabs open, but it wasn't like this before.

    I will be very very happy when my "dream" model finally shows up in the refurbished store! I do love my MBP, but I'd love it more as a back-up computer! Thanks for the advice! I always appreciate your comments here.
  6. motrek macrumors 68020

    Sep 14, 2012
    Yes, it's almost impossible to predict which web pages (tabs) will take up CPU power.

    Usually what takes up all the CPU power are poorly coded ads (either in Flash or just JavaScript), and ads are often/usually random.

    So you can't just say "hey, I went to the same web page so it shouldn't be taking any more CPU power than last time" because that page might be showing a random ad that heats up your computer and sucks down battery power.

    If you can get smcFanControl working, it can be worth it. Then you can just check the corner of your screen (the menu bar) and see if your CPU temperature or fan speed is higher than normal, then you know that something is misbehaving and you can try to sort it out before it uses all your battery power.

    Chrome has a useful feature called Task Manager (accessed via the Window menu) that will show you how much CPU power each page and plug-in is using, and allows you to close whatever you want on a case-by-case basis.

    Hope this helps, and thanks for the kind words about my posts. :)
  7. Mike MA macrumors 68000

    Mike MA

    Sep 21, 2012
    Same problem here, especially when on charge.

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6 June 14, 2015