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http://apple.stackexchange.com/questions/164923/rmbp-kernel-task-spikes-when-connecting-more-than-one-external-monitor

Disable kext by renaming it:

cd /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/Plugins
sudo mv X86PlatformShim.kext X86PlatformShim.kext.disabled

Clear kext cache: (not sure if this is needed)

touch /System/Library/Extensions/
Restart:

After installing OSX updates you may need to repeat the above procedure if the updates have re-created the kext.