I assume that they have to do a lot of reconfiguration of servers in order to handle the huge volume of orders which hits when ordering opens. People complain when they can't get their order in at 5 am. Delays can run 20 minutes or more. Vaguely remember that they set up a special crisis center to stage the rollout. It seems that they don't enable ordering everywhere from all partners at the same time. Looked as if they enable some ordering channel, evaluate the load, and then enable others as capacity is available. Not only do they have to worry about their servers but they also have to handle the orders from 3rd party carriers. I would think that increasing server capabilities by (10x?) times is a complicated task.