You can't fly fast and long distances due to the new multiplayer protection.

As in the title. When you are flying fast or long distances, you gets stunned and then continues flying with low speed. It's the same with "sprint-flying" in the air and after a while you gets stunned and continues flying. I have made a GIF to provide that this is true.

https://gyazo.com/99b0fa9453f18692abdabf79c57b87be --GIF