Long load times mystery

For the past three days, one group has had incredibly long load times and I am trying to get to the bottom of it. I checked our district network and they said it is all good on their end. This is my third trimester on the same quests and I haven't had this before when all I go in and do to a quest is adjust the date. It is really difficult to keep the momentum going in class with busy 6th graders when they are constantly waiting to load. I need ideas of things to try.
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