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Task manager on my PC isn't showing much activity with the constants I originally used, but that could be because it's an overclocked quad core. It shows 0% for anything less i<12000 and time.sleep(.001), but then it jumps up to 8%

.001 appears to be the minimum for time.sleep. Less sleeping time should mean more CPU usage.
 
I had a similar problem with a Wireshark startup script.

Try running the following:
sudo xattr -r -d com.apple.quarantine /Library/StartupItems/ShhMBP

This will remove the com.apple.quarantine attribute that the OS is setting on files which have been downloaded from the Internet.

If you want to confirm that this is the problem before running the above command, the run "ls -l -@ /Library/StartupItems" and look for the com.apple.quarantine attribute on your folder.

Hope this helps!

Worked for me.... thanks.
 
With the method you posted i was still getting the insecure start up items message.

This is a fix for that. It moves the ShhMBP from the start up items to the utilities folder and uses a user daemon to start the program when the mbp boots up.
 
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