Instrument cluster vacuum meter reaction time?

Kind of strange but I suppose the factory did that to reduce fluctuations from a less-than-perfect tune and/or fouled plugs, etc. My Auto Meter vacuum gauge has no "delay" at all, it'll flicker up and down as my engine idles if it's cold or I don't have the tune spot-on and it moves instantaneously with the throttle. I prefer it that way.