I'll add to that. I recently purchased some of the official WotC adventures for D&D 5e, and the lag when using them in a campaign is ridiculous. Opening a character sheet the first time is as quick as in other campaigns, but from the 2nd time onward it gets to 10+ seconds (also when editing & then saving). I understand that these are big campaigns with lost of pages, handouts, characters, dynamic lightning and so on, but I actually dread the first session in the updated campaign this week. The adventures themselves are pretty cool, and they reduce prep time by a lot, but running a campaign where everything takes 10 seconds or more to open is not really feasible, is it? Using the D&D5 OGL sheet, of course. Campaigns are pretty much as bought (problems started right off the bat without many changes except adding a PC or two) Official campaigns: HotDQ, RoT and LMoP (so that big); EDIT: and Curse of Strahd No difference, issues persist even on blank screen. Have not tried much else, since I was only prepping games, but that is bad enough in itself. I'm considering creating new, blank campaigns and just importing whatever is necessary, but that's a workaround at best.