What’s a best practice to follow when designing an experiment to test Performance Max campaigns?

• Create a new CPA or ROAS goal for Performance Max campaigns to achieve.
• Keep Performance Max budget limited to 10% of other campaigns’ budgets.
• Optimize Performance Max to a comparable CPA or ROAS target to other campaigns.
• Run the Performance Max experiment for one to two weeks before evaluating results.

The correct answer is:

• Optimize Performance Max to a comparable CPA or ROAS target to other campaigns.