I don't know. I'd say that anything that is added into a movie that makes the plot simply come to a screeching halt for it is something that negatively effects the pacing. At least, that's how I see it. I've only edited together short scenes for class, though, and I was never allowed to take anything out. But the scenes they edited back in were completely unnecessary. As if we really need to see Anakin and Jar-Jar fly to their next destination. As if we really need to know who any other racer besides Sebulba is. Take the movie Cars, for example. They didn't waste time giving a big introductory sequence of every car in the race. They only showed the three that mattered that mattered to the plot.