System Configuration : System Setup : System Usage : Managing System Resources

Managing System Resources
To monitor the usage of resources during a Pro Tools session:
*
Choose Window > System Usage.
To reduce processing load, do one of the following:
*
Reduce the density of automation in places where it shows the most activity. For details, see Thinning Automation.
– or – 
*
Turn off meters in Sends view, if enabled (by deselecting Show Meters in Sends View in the Display Preferences page). For details, see Individual Send Views and Meters.