As you already know, item frames are counted as entities, and entities cause lag It'd be cool if you'd limit the item frames for less lag Maybe 45-50?
Neutral, Some Rich people have over 50 rares on item frames on their wall right now and I have 144 map arts on my tower. (If we do this will over 50 item frames disappear?)
maybe they could be told if this has been done, but not remove the item frames. just get them a warning when this has been done, and it'll remove them around 5 days after they logged back in I think it would help a bit