Usually I can tell pacing is off in a book when I start skimming. In a movie, if I keep glancing at my watch, then I know something is wrong.
But how do we get the pacing right?
I think conflict is a huge part of it. Think how Harry Potter would read if the only bad guy was Voldemort, or how Twilight would be different if Edward didn't crave Bella's blood. The addition of conflict helps increase the tension and move the pace forward.
I know really great authors who have admitted they struggle with pace. So I want to throw it out...what is your suggestion for keeping a good pace in your novel? Also, what are some examples, good or bad, that show this?