The movie that Netflix told me would arrive in three days, did exactly that, but it didn't come from San Jose like I expected. It came from Denver, Colorado.
However, even if it did come from San Jose, it doesn't have to mean throttling. Netflix has said that when a movie comes in, if it's not in anyone's queue, it goes back to San Jose, to storage, because the local distribution centers do not have storage facilities. It's possible that this happens to a small percentage of films. It's probably random. If you are digging deep into the Netflix catalog for your titles, it will happen to your films, too.
Netflix gives you your own personal Netflix store, made up of personalized recommendations, based on your own unique taste, so you can't expect every title to be on hand at your local distribution center all the time.