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My Macbook Pro running Mountain Lion slows down dramatically when the battery is below 4-5%. All the applications running are very slow to respond, and several have the "Application not responding" message when I right-click on them in the dock. Now everything works fine when the battery is above 5%, so I'm wondering what goes on when the battery is low that causes the performance drag. Basically, I have two questions:

  1. What is causing this lag (for the sake of curiosity)?
  2. How can I fix it (for the sake of practicality)?

System Info:

  • Device: Macbook Pro (Spring 2012) 13-Inch running Mountain Lion (10.8)
  • Memory: 8GB
  • Processor: 2.8 GHz Intel Core i7
  • Storage: 500GB SSD Drive with more than half free
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It sounds like CPU speed stepping to me. –  ephsmith Aug 19 '12 at 23:16
has the provided answer solved your problem? Because I don't see any of the described settings in 10.8 –  barbaz May 1 '13 at 8:56
@barbaz - It didn't really solve the problem, but it seems like there is no solution so I accepted it. –  qegal May 1 '13 at 12:06
Same problem with MacBook Air 2013. –  KPM Nov 20 '14 at 12:47

1 Answer 1

up vote 6 down vote accepted

See if this link provides you with some useful knowledge. http://smallbusiness.chron.com/change-processor-speed-macbook-pro-43635.html

It's likely that the MBP is automatically scaling the processing power back to conserve battery power, but that isn't necessarily the only cause.

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