As wizards, clerics, and druids advance in level using the 5E character sheets, my players add all the spells their level can cast or that they have in their spell book and then mark those spells they want to have prepared after each long rest. As they reach higher levels there are a lot of spells in their list of potential spells. We have noticed there is quite a bit of lag when they want to open their character sheets when there spell lists get large. Any ideas?