I seldom record my sets. thing is, when I perform I have a near photographic memory of the crowds reaction. Pretty much as soon as I walk off stage I start thinking about everything that happened. What worked and what didn't work. I focus mainly on what needs to be improved upon. Things I can change and jokes that flat out need to go. I only test material at open mics though. Shows only get proven stuff. So to answer your question, constantly. Sometimes I'm even too hard on myself admittedly. I could have an amazing set but I'll focus on one joke in my set that didn't do so hot instead of acknowledging that I had a great set overall.