Kernel_task using 300% CPU time, high fan speed and slow computer in MacBook

Your MacBook has become slow lately. Activity monitor shows kernel task is using around 300% CPU. The fan is always on at high speed.
Solution:
1. Go to the folder .This can be achieved in Finder using Go + Go to Folder or press cmd+shift+G

/System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/Plugins/ACPI_SMC_PlatformPlugin.kext/Contents/Resources

2.Move all to a folder that you can find again if needed.

3.Restart and you’re done

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