raids fps issue

[Solgath]

the issue i found is that my fps goes to out the window when in a raid of 10+ ppl, perfect example and what got me onto the issue is doing AV, my fps slowly drops as the party grew, hits 40 raid and my fps goes from the normal 80 or so, to 20 or below, changing to just player shown tab, puts my fps back where it should be.