The queue is dependent on how many trains they are running and if they need to stop the belt for some reason, usually to pull of someone that doesn't fit. Rode Sunday and it was a shorter but slow moving line. I think they only had 6ish trains on because there were at least 5 I saw in a row then a good 3 mins of an empty load belt. I'm not sure if they just had to pull some due to issues over the day or just figure running less is better than going down for stacking if they are having issues with boarding. They use to be more agressive at screening guests but seemed to have given up on that again lately. When they have all the trains on the line flies.