Doing a magic set is like doing sex. You got a foreplay, to see what everyone likes, then you get down to serious business and pick up speed, thrusting the magic back and forth until everyone reaches the climax and the magic happens.
What a weird metaphore, but it fits. There is even a "cigarette after"-trick.
Most magic performances lack the climax. Not the climax of the effects, but a climax of the show. Leaving the audience unsatified. Don't be a bad lover. Have a trick, that really ends the show, some trick that everything builds to. You can even hint it. I do the cups and balls and one of the lemons keeps appearing throughout the show. I always put it away with the comment "Not yet!".
That nicely foreshadows a lot of things.
Realizing that helps to get the act together. It helps to know when to pick up speed, and when to stop talking and when to get to the point.