Strange, but simple problem that I see no reason for, but I like to play Huge games with 5 systems: As empires epand to a decent size and more stuff is going on, a simple chat message from any AI brings my framerate to a crawl until it disappears. I don't know if this occurs in multiplay.
What frustrates me is there is no option to relegate chat messages to the update tracker or something, without bringing my framerate down. Or why something so simple isn't optimized the way it ought to be to begin with. Very strange.