Tablets are very good if all works properly. There is still a lot of room for improvement to make things more reliable. Both software and hardware crashes can kill a lot of time.

A lot of time can be wasted or saved depending on how attentive the score keepers are during the event as well as if enough score keepers are available. This can be huge and I don't think this is discussed enough!

If queues are not setup properly, then it will also cause a line slowdown. Example being Expo. Game specific queues are always better than one long queue, but the layout at Expo may not allow differently. There is not a lot of room in the hallway used there.

Most of these scorekeepers are volunteers or are getting very little in return for their time, so make sure to be very nice to them. I appreciate what they do and it appears to me that it is usually a thankless occupation.

Many people new to tournaments may not understand the line queues, especially the single line queues. They can appear very overwhelming to even the tournament veterans when thinking about how much time they want to spend in line trying to qualify for an event.