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safari drastically increases CPU usage

1664 Views 11 Replies Latest reply: Nov 27, 2013 4:09 PM by MrElvey RSS
MBBM Level 1 Level 1 (15 points)
Currently Being Moderated
Apr 20, 2013 1:48 PM

Safari causes my CPU usage to skyrocket which causes my MBP to freeze. Aside from an online backup service I use, Safari was the only thing active at the time. I've found Safari to be the problem since neither Chrome nor Firefox cause this to happen. I did a force quit on Safari a couple of times (and eventually reset Safari) and still am having the issue. I don't have Java enabled due to its recent rash of security problems. I don't have any extensions installed that don't come recommended by a trustworthy source. Activity monitor shows 'Safari web content' CPU usage at 100%. Anyone have any suggestions as to why this may be happening and how I can remedy it?

MacBook Pro, Mac OS X (10.7.4), 2.4GHz i7 16GB 256GB SSD Late 2011
  • Linc Davis Level 10 Level 10 (107,650 points)
    Currently Being Moderated
    Apr 20, 2013 5:49 PM (in response to MBBM)

    Disable all extensions, trustworthy or not, and test.

  • DanH Level 5 Level 5 (4,370 points)
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    Apr 21, 2013 7:04 AM (in response to MBBM)

    v 6.0.4 appears to have a huge meory leak, slams the CPU, freezes, refuses to load pages and has to be force quit frequently.

     

    Here's hoping this downgrade gets fixed, soon.

     

    -dan

  • ~Bee Level 7 Level 7 (30,580 points)
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    Apr 21, 2013 7:36 AM (in response to DanH)

    DanH & MMB--

     

    I would double check your extensions and browser add-ons.  Perhaps you've got an old one on there that is no longer compatible. My Safari works great, so I know the basic app is non-problematic.

  • DanH Level 5 Level 5 (4,370 points)
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    Apr 21, 2013 7:49 AM (in response to ~Bee)

    Thanks Bee. Since posting I have done that. I have no add-ons and only one extension: LastPass.

     

    Disabling it fixes the memory leak/CPU usage, so either LP did something "illegal" in its code, or Apple broke something in this version of Safari.

     

    -dan

  • Klaus1 Level 8 Level 8 (43,365 points)
    Currently Being Moderated
    Apr 21, 2013 10:20 AM (in response to DanH)

    Which is another way of saying that your version of LastPass is not compatible with the latest version of Safari.

     

    Check with the developers for an updated version, or delete it.

  • DanH Level 5 Level 5 (4,370 points)
    Currently Being Moderated
    Apr 21, 2013 11:06 AM (in response to Klaus1)

    No Klaus, that is not what I said. It means just what I typed: either the extension is incompatible or Safari is. Neither you nor I know which it is at this point, so your suggestion to "delete it" is not helpful.

     

    Unlike you, I did something constructive. I alerted LP that their extension is not working with the latest version of Safari.They must be staffed by adults, because they somehow resisted the temptation to suggest I delete Safari.

  • Klaus1 Level 8 Level 8 (43,365 points)
    Currently Being Moderated
    Apr 21, 2013 11:21 AM (in response to DanH)

    I obviosly did not suggest deleting Safari!

  • ~Bee Level 7 Level 7 (30,580 points)
    Currently Being Moderated
    Apr 21, 2013 1:26 PM (in response to DanH)

    Dan, I'm glad you checked your extensions, and have at least discovered the conflict.

    All the best.

  • DanH Level 5 Level 5 (4,370 points)
    Currently Being Moderated
    Jun 5, 2013 6:04 AM (in response to DanH)

    Update: Safari 6.0.5 appears to play nice with LastPass.

     

    -dan

  • MrElvey Level 1 Level 1 (25 points)
    Currently Being Moderated
    Nov 27, 2013 4:09 PM (in response to DanH)

    DanH, MBBM, etc:

     

    Can you provide (more) info on your recent experience with Lastpass in Safari? 

     

    Mine: I just did some testing to confirm why Safari is such a dog sometimes. This is on a 6GB MacBook Pro.

    First, I disabled all extensions, and relaunched Safari after enabling/disabling Lastpass.  After each relaunch, I allowed it to reload the same 21 tabs,switching among them 'till they really load, and looked at the RAM and CPU usage reported by ps, combining all Safari processes.  I ran each of these multiple times (twice, or more if there was a big discrepancy) and averaged the results:

     

    I'm running Safari 6.1 on 10.8.5 with Lastpasss 3.0.15, and trying to decide whether I should give up on Lastpass and move to Safari's iCloud Keychain on 10.9 (Mavericks), or try MBBM 's fix.

     

    Without Lastpass: 13% memory usage, CPU 8-12% typical.

    With Lastpass: 31% memory usage, CPU 60% typical, slowly quieting down to 10%.

     

    Again, these tests are average results, from minutes after launch. 

     

    (I also tried some other things - disabling all/no plug-ins, Javascript, etc.; results not included but available on request, but the gist is that LastPass is the culprit.)

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