Lagging Chapter Switch [FIXED]

When I switch between items in the binder (just in Single View Mode), it lags … about six seconds to switch from Chapter Two to Chapter One. I didn’t have that problem with the tutorial, or with the short story I copied-pasted in (in sections). But I imported last year’s NaNo, and am attempting the Split With Selection (Chapter Heading) As Title.
So, obviously, the novel is longer than the short story, and the chapters are longer than the short-story scenes or the tutorial sections. Is that all it is? Either way, the wait time between deciding I want to look at the draft and actually being able to see the draft is annoying.