Very High CPU after upgrade from Yosemite

Discussion in 'OS X El Capitan (10.11)' started by yoelca, Oct 1, 2015.

  1. yoelca macrumors newbie

    Oct 1, 2015
    I am getting a new MBP with yosemite, and upgrade directly to El capitan. After upgrade, I find out the fan is quite noise, and CPU is very high.

    I found out it is all the system process in high CPU, including launchd, UserEventAgent, ... Anyone has similar experience? any hint?

    I did not do TM backup yet, and I can not get the Yosemite download from App Store. Any way to move back to Yosemite?


    High CPU.png
  2. beebarb macrumors 6502


    Sep 10, 2015
    How recent was your upgrade?
    It can take a few hours for the new install to 'balance out' as it were.

    Initial installs or upgrades will have a period of reduced performance, and high activity, while system and application caches are rebuilt, and search indexes are updated.
  3. yoelca thread starter macrumors newbie

    Oct 1, 2015
    I just upgraded last night. I may wait a few hours more to check any improvement. Thanks for the info.
  4. Shirasaki macrumors G3


    May 16, 2015
    If your Mac comes with Yosemite, things are easier since you can use internet recovery to bring Yosemite back.

    If not, then you may need to download Yosemite from elsewhere, or find the true download link to download Yosemite from Apple server.
  5. SRLMJ23 Contributor


    Jul 11, 2008
    In between Syracuse, NY and Albany, NY
    You have to give the system time to do all its background tasks, especially Spotlight when it is Indexing. Sometimes it can take a couple days of solid use for your system to get flyin' again! Do not worry, your system will come need to go back down to Yosemite.

    If for some reason, after say 3-5 days, or one week max your system is still acting up then I would say something might have gone wrong during installation and you I would recommend you do a clean install of El Capitan.

    In my opinion it is always better to do a fresh install of a new version of OS X. You might consider that, as well.


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4 October 1, 2015