How you answer this question will offer the interviewer insights into your confidence and self-perception. They'll have their viewpoint, and you'll have yours. Ideally, you'll want to align your realities. Doing so will offer them confidence in self-awareness. If you feel you could have performed better, don't self-deprecate. Give yourself a fair assessment and circle back to the questions you wish you could have answered things differently. That will show that you are thorough in your approach to your work and don't waste any opportunity to succeed.