Even though I've only been on it twice, I've noticed that Pandora's line seems to be the slowest moving of all the mazes. I think a large part of this is because they're frequently stopping it to let all the people from Us exit.
Also, have they already essentially given up on the short pre-show for Pandora? The first time I did it on Friday, we caught the door opening, but Sunday night, even though we were maybe the 3rd group to be let into the maze, the door was just already wide open.