Alright, I know I'm not the only one who feels this way - lots of people are requesting dimensions, etc. Well, for me, my game doesn't lag too terribly from the amount of people - moreso, my problem is the "____ has arrived!" "_____ has left!" "_____ has disconnected!"
This is terribly annoying, especially when trying to RP or just chat with some friends in Group chat. Even when you turn off all the other chats, and the 'Actions' tab (which I originally had hoped was for these annoying messages), you still get spammed by the little orange messages. So far almost every RP I've attempted has been ruined by this. If I have to brb or something, or even if I look away for a moment, I am almost instantly shut out of the RP (as in I can't post), because I missed the last message.
My idea is actually a bit different than others' about this...
You know how you can turn off various chats - General, Local, etc.? Maybe when you turn those off, the messages associated with them go off too. For example, if you only have Local on, you'd only see people who disconnected near you or whatnot. And if you only have Group chat, you'd only see your group's messages.
Whaddya think?