Slow performance, kernel_task 340% CPU usage
After cleaning my mac from a liquid spill got a new problem: extremely slow performance, kernel_task at >300% CPU usage, fan's very loud.
Is there a solution to this problem?
Update: ran the hardware test, result: No trouble found.
Tried to reinstall OS, no change
I don't think this is hardware related. Otherwise, Safe Mode wouldn't help.
Start normally. Check Console.app for extensive error reports. (Look out for kernel error messages, maybe you'll find the bad kext and are able to disable it, see later in the answer.)
Start in Safe Mode.
Disable any Login Items (in System Preferences / Accounts)
Run the following in Terminal:
kextstat | grep -v com.apple
This should show you all third party Kernel extensions. You can then disable everything that sounds suspicious by navigating the Finder to
And rename the kexts you investigated to f.ex. ***.kextbackup, then reboot (normally).
If the system works, you can re-enable the kexts and login items one by one and find the bad one.