In Spain we say: "Good things, if brief, are twice as good"
Here at PPrune is common place to read more than one explanation to one question, even if they are the same. It always adds something. For instance, if the next time Macarto climbs he notices how the speed target decreases knot by knot after the IAS to Mach change over, he will get a very intuitive idea of what is going on.
But, I admit it, I am not the inventor of jet airplanes performance.