same here. in practice its almost never an issue. Always I try to use transducers first. Where its not possible, I ask is the data very large then use lazy sequ

same here. in practice its almost never an issue. Always I try to use transducers first. Where its not possible, I ask is the data very large then use lazy sequences else mapv. I am using clojure for my side projects & hustles. If the project is quick and dirty who cares how its implemented. If project evolves to more serious product, I should re-write anyway and optimize the critical code paths.