Change how often information is updated in Activity Monitor on Mac
You can change how often the information in Activity Monitor is updated. By default, the information is updated every 5 seconds, but you can update information more frequently for more precise monitoring.
In the Activity Monitor app on your Mac, choose View > Update Frequency, then choose how often you want to update.
Increasing the update frequency may affect your overall system performance.
To see how much processor time is being used to update Activity Monitor information, watch the CPU Time column in the CPU pane of the Activity Monitor window as you change the update frequency.