This is probably a no-brainer, but I (over many years of basically teaching myself this software through trial and error) have many events that repeat in every frame - i.e. the movement engine for the player. To clean up everything and get a little more professional about this whole process, it is worth it to put all the events common to every frame into one group in Global Events that will then filter to all the levels? Does this make a big difference in disk space/performance? Sorry if this is common knowledge, I don't have a programming background.