One thing I can say is that in my previous startup we did not do co-founder performance reviews, and it hurt us immensely. I haven't been able to figure out how

One thing I can say is that in my previous startup we did not do co-founder performance reviews, and it hurt us immensely. I haven't been able to figure out how to do appropriately critical or praiseful performance reviews, but I think that it is tremendously important.