Fixed the fan running high, kernel task taking up 500% cpu (high cpu) on macOS

fixed_kernal_task_high_cpu_on_macos.md

Fixed the fan running high, kernel task taking up 500% cpu (high cpu)

Step 1: Disable SIP

Enter recovery mode

• Shutdown your macbook
• Press keys: Command + R
• Press power button
• Release keys Command + R when see Apple logo appear
• Open Terminal app on recovery screen, then run below command:

csrutil disable

• Shutdown your macbook

Step 2: Disable kernal plugin IOPlatformPluginFamily

Enter single mode

Hold down Command - S immediately after pressing the power button when turning the computer back on. Keep holding until a bunch of white text on black background appears.

• When the white text finishes scrolling enter:

fsck -y 
mount -uw /

• Backup IOPlatformPluginFamily.kext

rsync -av /System/Library/Extensions/IOPlatformPluginFamily.kext /Users/Shared/

• Delete IOPlatformPluginFamily.kext

rm -rf /System/Library/Extensions/IOPlatformPluginFamily.kext

• Restart your macbbook

shutdown -r now

Waiting your macbook restart complete.

Your macbook run fast again.

Done.

:)

but after several hours, the cpu usage of kernel task is still very high in big sur.