A. Wait until the next Sprint Retrospective as it is the most opportune time to modify the Definition of Done.

B. Bring the concern to the testers in the Development Team and ask them to include performance testing.

C. Explain to the Product Owner that it's up to the Development Team to. decide on acceptable performance standards as they own the Definition of Done.

D. Encourage the Product Owner to bring the performance concerns to the Development Team and work with them on how to improve performance, and ultimately have stronger Definition of Done.