There are options in the game to see less characters on screen, hide names, all kinds of things to help with graphix/fps. They need to give the elites priority to load over characters like they did Odin and Behemoth. They did this I think, but they didn't get it right.

Immunity would mean people would have time to group up even if they were solo and just in the area, allowing people to get credit where credit is due. I can't tell you how many times I've seen someone find an elite solo then can't get into a group before the pull & only get 1 seal on a B rank, or 3 seals on an A rank, while the 1st group that got there after the find gets full credit for 8 members.