No seriously, it's long range explorers in the friends list.
Me and the a-team was playing on mobius a few days ago.
One guy logs in on Dawg and Kharma's friend list, and their FPS goes from 60++ to <20.
They see this guy is 20k+ ly out in the boonies and unfriend him, and immediately their fps skyrockets back to normal levels.
Changing to a group where these friends aren't online does sort of the same thing, since ED is only trying to match people in the same group.
And seriously if they are 20k+ away from you how likely is it really they are going to do anything cooperative.
Honestly, if I was out exploring I'd solve this the other way around, and me as the long range explorer played in solo.
Hey I'm Thor -
People call me Bob.
Rule 1: Pillage. Then burn.
Rule 2: No such thing as overkill, as long as there are reloads.