MacBook slows down (runs slow) on battery, how can I fix it?

Checking the battery

First of all, we have to make sure that it is your MacBook battery that is to blame for the performance issues. How do we do it? Very easy:

1. Plug your MacBook into the charger and open the proprietary application System control. You can find it through Spotlight search in the upper right corner of the screen or in the Finder tab under Programs, or through Launchpad (the icon with the rocket on the Dock) in the folder Others.

2. Looking at the U performance in%.

3. Unplug the charger and check the U performance again. If it has dropped significantly, it is clear that the battery is to blame for the "brakes."

MacBook slows down when running on battery: 3 ways to fix the problem

Delete the PLIST file (the method is only valid for Apple laptops manufactured before 2011)

The first thing to do is delete one of the system files with the .plist extension, which tells your Mac to slow down when running on battery so it lasts longer. However, in practice, with this setup you spend more time running applications and transacting, not to mention lost nerves, so there's not much benefit here.

To remove the "harmful" .plist file:

1. Find the model number of your Mac. To do this, click on the Apple menu (upper left corner), select About This Mac → System report. The information we need is on the line Identification model..

2. You can now proceed directly to the removal.

• In the Finder, select your hard drive (usually called Macintosh HD. If it's not there, on the menu bar, select Ir a → Computer → Macintosh HD or the name you have given it personally).
• Then open the sections one by one System → Libraries → Extensions.

• Scroll down and find the text file called IOPlatformPluginFamily.kext.

• Right-click and select Show package content → Content → Plugins.
• Right-click on the file. AI_SMC_PlatformPlugin.kext and select → Show package content → Content → Resources.

• Find the .plist file whose name matches your Mac's model number in the list and delete it.

• Restart your computer for the changes to take effect.

Reset the Mac's SMC and PRAM

Resetting the System Management Controller (SMC) and System Configuration Memory Area (PRAM) helps solve many Mac problems, and reducing the performance of your MacBook when running on battery power is one of them.

It is important: Read the instructions to the end first and then act accordingly.

How to reset the SMC on a Macbook

• Turn off your MacBook;
• Plug in the charger;
• Press simultaneously on the keyboard ⇧Shift + Ctrl + ⌥Option (Alt) left side + power button;
• Release simultaneously ⇧Shift + Ctrl + ⌥Option (Alt);
• Turn on your MacBook.

How to reset the PRAM

• Turn off your MacBook;
• Press the power button;
• Before the gray boot screen appears (right after hearing the welcome sound), press simultaneously ⌘Cmd + ⌥Option (Alt) + P + R.
• Keep them pressed until the computer restarts and the second time the system power-on sound is heard;
• Drop the keys.

Note that after resetting the PRAM some system settings will be reset: time, volume, mouse and keyboard settings, etc.

Run First Aid in Disk Utility

If the first two methods didn't help, try fixing the disk's permissions (rights). Some s have reported that this "solution" has helped them.

To do this, open Disk utility. and select your MacBook's primary hard drive, then click the button named First aid..

The program will check your disk for errors and, if necessary, will restore the necessary parameters.

If all else fails.

… Then it makes sense to Apple technical or an authorized service center. Be prepared for the fact that you will eventually have to replace the "problem" battery with a new one.