Sure. My function queries an external database (jdbc) along with a delta table. I'm not performing any expensive computations - just filtering for the most part. When printing timestamps in the function, I notice that most of the time is being spent on the latter (delta table query/manipulations). I don't know why that is. I even cache the tables when I query. When I functionalize, the result takes 15 min and if I run outside of a function, it takes 3 min.