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Quick Tip: Boot your Mac in 64 bit mode

I’ve been tuning Photoshop performance on some decently specced Mac Pro workstations. They’re older machines than the current model and by default don’t boot in 64-bit mode.
Whilst Photoshop runs in 64-bit mode under a 32-bit kernel, you will get better performance with 64-bit apps on a 64-bit kernel.

You can force your Mac to boot in 64-bit mode by holding down a key combo at startup, however this isn’t really practical as a permanent solution.

The easiest way to set the machine to boot always in 64-bit mode is using the systemsetup command:

sudo systemsetup -setkernelbootarchitecture x86_64

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