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  1. #1
    MacBook Pro runs very slow when unplugged

    Member Since
    Feb 23, 2012
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    Question MacBook Pro runs very slow when unplugged
    My 2011 MacBook Pro runs amazing when i have it plugged in. Very fast, no lagging and all apps run smoothly. when i unplug it from the power source it is terrible! everything lags. i cant even scroll in a web browser. any idea why this happens? and how i can fix it?

  2. #2
    MacBook Pro runs very slow when unplugged

    Member Since
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    i have the core i5 processor and 4gb memory

  3. #3
    MacBook Pro runs very slow when unplugged
    chscag's Avatar
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    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    It sounds like the machine is being throttled back because it can't "sense" that it's on battery. In other words, the machine thinks the battery is removed. It could also be other causes. Try resetting the System Management Controller first. See this Apple KB LINK. If that doesn't work, make an appointment with your local Apple store to have it looked at.

  4. #4
    MacBook Pro runs very slow when unplugged

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    Feb 23, 2012
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    well that didnt work. still runs terrible when unplugged from the power adapter. i guess ill make a trip to the apple store down the road. is there no way for me to manually change what the computer does when i unplug it?

  5. #5
    MacBook Pro runs very slow when unplugged
    I.M.O.G.'s Avatar
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    Sep 02, 2010
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    I believe Mac's are meant to be admired, not owned
    I'm an OSX amateur, but in windows you can configure power options. One of the options are to set separate power profile for battery usage and plugged in usage. On battery, i5 processors use speedstep to scale back the processor power and conserve battery life by default. However in the power profile, you can set it to use more power when on battery.

    Are there similar power profile options on a macbook pro?
    Matt Bidinger
    Community Manager

  6. #6
    MacBook Pro runs very slow when unplugged

    Member Since
    Feb 23, 2012
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    im familiar with what you are talking about but from what i can tell that same function does exist on a mac

  7. #7
    MacBook Pro runs very slow when unplugged

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    Feb 23, 2012
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    someone please let me know if it does, i believe that is something that could solve my problem...

  8. #8
    MacBook Pro runs very slow when unplugged
    Deckyon's Avatar
    Member Since
    Apr 06, 2011
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    Louisville, KY - USA
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    Specs:
    MBP 17" 2011, 2.3GHz Intel Quad-Core i7, 8GB RAM, MacMini 2011, 2.7GHz Intel Dual-Core i7, 8GB RAM
    I cant see the settings for my MacBook Pro, but I think IMOG is correct, on the notebooks, you can throttle performance to help prolong battery life. I can only see my MacMini settings (the MBP is off at home, I am at work, remoted into the Mini).

    You will need to bring up your System Preferences and go to Energy Saver.
    MBP 17" 2011, 2.3GHz Intel Quad-Core i7, 8GB RAM, AMD Radeon HD 6750M 1GB RAM
    MacMini 2011, 2.7GHz Intel Dual-Core i7, 8GB RAM, AMD Radeon HD 6630M 256MB RAM
    iPhone 5S 64GB, iPad Air 2 128 GB LTE, iPod Nano Gen6 8GB, Apple TV 3 & 2

  9. #9
    MacBook Pro runs very slow when unplugged

    Member Since
    Feb 23, 2012
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    Quote Originally Posted by Deckyon View Post
    I cant see the settings for my MacBook Pro, but I think IMOG is correct, on the notebooks, you can throttle performance to help prolong battery life. I can only see my MacMini settings (the MBP is off at home, I am at work, remoted into the Mini).

    You will need to bring up your System Preferences and go to Energy Saver.
    that just has to do with the display going to sleep. i cant control the actual performance of the machine based on the power being plugged in or not

  10. #10
    MacBook Pro runs very slow when unplugged

    Member Since
    Feb 23, 2012
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    unless im missing something

  11. #11
    MacBook Pro runs very slow when unplugged

    Member Since
    Feb 23, 2012
    Posts
    20
    MacBook Pro runs very slow when unplugged
    is it possible to keep my mac from slowing way down when i unplug it? i cant seem to find anything on here to control that. i know on a PC you can pretty easily tell it to go fast or go slow whether plugged in or not. idk what the problem is exactly and it may not be fixable by changing something like that but i was just wondering if that is doable. thanks

  12. #12
    MacBook Pro runs very slow when unplugged
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
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    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    (As you've been advised, take it to your local Apple store and have them check it out.)

    No such settings exist for the MacBook Pro. And please do not cross post. I've merged your posts together here.

  13. #13
    MacBook Pro runs very slow when unplugged

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    Feb 23, 2012
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    Thanks for the help. Sorry for doing something so terrible.

  14. #14
    MacBook Pro runs very slow when unplugged
    I.M.O.G.'s Avatar
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    Sep 02, 2010
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    I believe Mac's are meant to be admired, not owned
    He was polite, didn't say it was terrible. It just creates more work for moderators, and it is confusing for other members because the same conversation is taking place in two different places - so they don't know whats already been recommended or attempted in the other thread. It is more polite to everyone to hold the discussion in one place. No biggy, just out to get you the right answer.
    Matt Bidinger
    Community Manager

  15. #15
    MacBook Pro runs very slow when unplugged

    Member Since
    Oct 04, 2007
    Posts
    76
    Not offering a solution, but thinking out loud. Slow scrolling in web browser, could there be a graphics issue either driver or hardware with the integrated graphics card that it could be defaulting to in battery mode, i guess the test for this is using the discrete card in battery mode?

    Also do you have some sort of battery/energy optimisation utility that kicks in when it detects the system goes on battery power that is hogging the CPU?

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