If a Performance Group is paused, and you wish to restart the optimization, click the blue button "Optimize" on the right side of the Performance Group. The optimization is now on. Related ArticlesHow to Automatically Add New Campaigns to a Performance Group So the Optimization Starts Immediately?Does optimization stop if there is one or more paused campaigns within a Performance Group?How to NOT Automatically Add New Campaigns to the Optimization?How to Create a New Performance Group?Video - Performance Groups & Goals