I've been having alot of Map problems lately that never happened before. It began happening after the new update. Well, when I'm in a map, if there are more than 2 people besides myself on it and I look in the group's direction, I lag horribly. This causes problems for my roleplaying, because without looking at them, I can't position myself correctly, or see what they're doing, etc. Now, this isn't with detailed maps. I've had my friend make a map that is SOLID, and FLAT. NOTHING is on it. Then I had the friend invite two of their friends and sit in a group. Whenever I looked at them, I lagged.
I do not have Feralistic, or any addons besides a few item packs for maps.