Calling All OSX Wizards.... How can I disable hyperthreading in OSX (10.9.3)? I have Xcode. Went Open Developer Tools > Instruments > Preferences > CPUs > Uncheck Hardware Multi-Threading. From there I've restarted; I've also invoked sleep mode and then woke the computer up. Either way, I'm still seeing 24 processors in Activity Monitor. What do I need to do to get it to take?? And if I end up preferring it, what do I need to do to make the computer keep that preference (after reboots, et al)? Thanks!!