How to Change the Process Priority on a Mac (5 Steps)

Click 'Applications' on the Dock, then 'Utilities.' Click 'Activity Monitor.' Leave this application open.
Click 'Applications' on the Dock, then 'Utilities.' Click 'Terminal.'
Check in Activity Monitor for the process you want to change. Each process is assigned an ID, the PID (process ID). Make a note of the PID.
Switch back to Terminal.
Type 'nice +20 -p 0000' (without quotes). Replace the '+20' with a value between '+20' and '-20.' -20 is the highest priority item and +20 is the lowest priority item. The '-p' parameter determines to affect a process. Replace '0000' with the process ID (PID) for your process. Press 'Enter.'
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