How do Performance Max campaigns work? Performance Max campaigns are customizable, with the option to add manual input and advanced AI. Performance Max campaigns allow you to have full control over the campaign setup, ad, and bidding. Performance Max campaigns drive simplicity, performance and reach by optimizing toward the retailer's business goals while providing manual controls to optimize performance. Performance Max campaigns use AI to optimize toward the retailer's business goals across Google's suite of ad networks. This drives simplicity, performance, and reach