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Question: MBP Running slow when its on batteries .. working fine when plugged to the charger ?!

Hi there !
I noticed that my MBP is running very slow when it's on batteries.. but when plugged to charger it works fine..

Is the battery drained already ? I purchased it OCT 2011 but has been using it lightly for almost 5 months ..

P.s : I cleaned it up coz I thought its a space or piled files issues but it didn't work




Thank u in advance 🙂

MacBook Pro, Mac OS X (10.7)

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Aug 1, 2013 7:58 AM in response to RoXy1988 In response to RoXy1988

Try this at your own risk - It Worked for me after a complete system reload which didn't make any difference.


I will take no responsibility for any damage or loss caused to you or your property. Do it of your own free will and at your own risk.


I did this on a MacBook Pro Early 2011 - 2.7 GHz Intel Core i17

System Version 10.6.8 Snow Leopard


Running well on mains power but dramatically slowing down when running on battery power


First try this to see if you get the same result I got


Quit all programs

With the mains connected

Open Activity Monitor and click on CPU in the bottom half of the window

Check the CPU Usage graph - It will probably be minimal - Under 1%

Now disconnect the mains and watch the graph shoot up and CPU activity around 80%


Here's what I did...


Again - I will take no responsibility for any damage or loss caused to you or your property. Do it of your own free will and at your own risk.


Firstly, you’re going to need the model identifier of your Mac,

go to the Apple in the menu bar and select "About this Mac"

When the About this Mac pane appears click on "More info…"


Select Hardware in the left panel

In the right panel make a note of the Model Identifier e.g. "MacBookPro8,1"


Now open a finder window and click on Macintosh HD

Click on system >Library > Extentions

Find the kext file called IOPlatformPluginFamily.kext

Right click it and Show Package Contents

Click on contents

Click on Resources

Click on PlugIns

Right Click on ACPI_SMC_PlatformPlugin.kext

Right click it and Show Package Contents

Click on contents

Click on Resources

Find the the plist file that corresponds to your Model Identifier e.g. "MacBookPro8,1.plist"

Move it to the trash and delete it

Restart and everything should now be fine.

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Jan 5, 2013 9:58 PM in response to RoXy1988 In response to RoXy1988

First, if you have encrypted any files using MacKeeper, unencrypt them using MacKeeper.


Then, read and follow the instructions here: http://mackeeper.zeobit.com/uninstall_mackeeper


You do not need to answer the "reason for uninstalling" question that appears.


Macs do not need "cleaning". Never install MacKeeper or anything like it ever again.

Jan 5, 2013 9:58 PM

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Jan 6, 2013 8:26 AM in response to RoXy1988 In response to RoXy1988

Reset the SMC, then test your MacBook Pro again.


SMC reset:


Before Resetting the SMC


Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.


  1. Press Command + Option + Escape to force quit any application that is not responding.
  2. Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
  3. Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
  4. Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.


Resetting the SMC on portables with a battery you should not remove on your own


  1. Shut down the computer.
  2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
  3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  4. Release all the keys and the power button at the same time.
  5. Press the power button to turn on the computer.

Jan 6, 2013 8:26 AM

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Jan 7, 2013 10:30 AM in response to RoXy1988 In response to RoXy1988

This is normal. The battery may appear to stop charging between 93 percent and 99 percent. The batteries used in these computers are designed to avoid short discharge/charge cycles in order to prolong the overall life of the battery.


If you think it is still running poorly while on battery power there may be an running process causing this that you may be able to fix. To determine what it might be read:


Runaway applications can shorten battery runtime


If you cannot find any obvious runaway process, consider performing the following two troubleshooting steps:


Creating a temporary account to isolate user-specific problems: Isolating an issue by using another user account


Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components. Read about it: Starting up in Safe Mode


If after performing these procedures you still think something is wrong, schedule a Genius Bar appointment:


Genius Bar Reservations: http://www.apple.com/retail/geniusbar/

Jan 7, 2013 10:30 AM

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Question marked as Helpful

Aug 1, 2013 7:58 AM in response to RoXy1988 In response to RoXy1988

Try this at your own risk - It Worked for me after a complete system reload which didn't make any difference.


I will take no responsibility for any damage or loss caused to you or your property. Do it of your own free will and at your own risk.


I did this on a MacBook Pro Early 2011 - 2.7 GHz Intel Core i17

System Version 10.6.8 Snow Leopard


Running well on mains power but dramatically slowing down when running on battery power


First try this to see if you get the same result I got


Quit all programs

With the mains connected

Open Activity Monitor and click on CPU in the bottom half of the window

Check the CPU Usage graph - It will probably be minimal - Under 1%

Now disconnect the mains and watch the graph shoot up and CPU activity around 80%


Here's what I did...


Again - I will take no responsibility for any damage or loss caused to you or your property. Do it of your own free will and at your own risk.


Firstly, you’re going to need the model identifier of your Mac,

go to the Apple in the menu bar and select "About this Mac"

When the About this Mac pane appears click on "More info…"


Select Hardware in the left panel

In the right panel make a note of the Model Identifier e.g. "MacBookPro8,1"


Now open a finder window and click on Macintosh HD

Click on system >Library > Extentions

Find the kext file called IOPlatformPluginFamily.kext

Right click it and Show Package Contents

Click on contents

Click on Resources

Click on PlugIns

Right Click on ACPI_SMC_PlatformPlugin.kext

Right click it and Show Package Contents

Click on contents

Click on Resources

Find the the plist file that corresponds to your Model Identifier e.g. "MacBookPro8,1.plist"

Move it to the trash and delete it

Restart and everything should now be fine.

Aug 1, 2013 7:58 AM

Reply Helpful (28)

Aug 11, 2013 9:57 AM in response to tony_stead In response to tony_stead

I am at the same point as the few reporting unexplicable CPU load after disconnecting the charger which leads to sluggish UI operation etc.. (MBP 13 early 2011, 2.3GHz)

Is this truely working? just wanting to confirm before I delete the file. I have a back-up just in case.


Thanks

Aug 11, 2013 9:57 AM

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Aug 11, 2013 12:30 PM in response to Yodler In response to Yodler

Just an observation to alleviate my concern about the possible side-effect of removing this kext file

The original explanation what this file is designed to do i.e. running a low level task to a max to cool the CPU does not make sense because when my CPU is at 40 -50 Grad C 20 min after a boot the kernel file is already hogging cycles to slow down all other apps. The kernel cycle hog does its job at any temperature it seems ......

Aug 11, 2013 12:30 PM

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Question: MBP Running slow when its on batteries .. working fine when plugged to the charger ?!