Carnival offers an early check in through some hotels there ports. The Queen Mary is one of these. On the morning of your sailing you can check in at the hotel lobby, this lets the cruise line know you are on your way and should save you time at the port. I am not so sure if this is much help or faster but they do offer it. I personally have never used it but a lot of others say that they have. I have however stayed on the Queen Mary and I love her. You can’t ask for a better way to start off you vacation cruise, then abord a the Queen.
Happy Sailing!