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Switcher Hangout The place for switchers to discuss their new machines, and how to work with OS X. General support can be had here for newbie stuff, like "How do I restart my new iMac?" :)

Slow Mac Book Air, high system cpu usage


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Stretch

 
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Quote:
Originally Posted by vansmith View Post
In the box that says "My Processes", change that to "System Processes."
Or better yet, All Processes.

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vansmith

 
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Quote:
Originally Posted by Stretch View Post
Or better yet, All Processes.
True, that will work. I was hoping that the system process list would make it easier for us since this seems to be a problem with system processes.

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milesmeridith

 
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As you can see from your help I determined the kernal CPU usage was extremely high. I opened up the console and determined that a program NasNavigator was spitting out a ton of messages. This is a program that scans the network for a Buffallo Drive. The mac already had a connection setup to their share drive with SMB so I uninstalled the program. After rebooting it was still spitting out messages in the console. I rebooted to safe mode and did a search on the entire mac for any file that started with "nas" or "nav" and deleted them. Rebooted to normal mode still seeing the messages. Any suggestions?
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kernel_task is a "representation" of the kernel which is responsible for low level operation of the OS. As such, it's not the kernel per se that is causing issues but something that is continually making system calls to it.

A quick search suggests that NAS software is notorious for causing this. I'd suggest that you reinstall the software and uninstall it using the prescribed steps (you seemed to suggest that you did this manually).

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So I uninstalled the program and errors went away in the console. However, The CPU usage problem still hasn't gone away.

Apple recommended doing the following.

Backup time machine to an external HD
Boot into repair HD and erase disk
Reinstall OS from repair HD
Perform Time Machine restore

Do you think this would work and would I still have my files and programs?
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