Why does Cincinnati slow everything down?

I have a shop I really enjoy ordering from, but unfortunately their packages always go through Cincinnati. I haven't lost anything yet, but my package is 4-7 days late every. Single. Time. Usually it hits Cincinnati about a day after shipping, sits there, and then once it finally moves I have it within a day or two. Something that seems like it should only take a maximum of four days takes over a week every time. What's going on in Cincinnati that they can't seem to keep things moving?