I have never had problems with a slow, choppy or jerky game in raid, bg and arena, nor on other private servers and even on official servers. But now I have these kinds of problems because of these cocmetic auras.

These "cosmetic" auras cause problems that should not be underestimated:

-the game goes jerky and choppy (in Alterac Valley especially)
-the proc of a player buff is not well visible because of these "cosmetic" auras

I'm not saying to remove these effects, but atleast to nullify them in pve raid and pvp(bgs,arenas,wg).
If player like these things can always use theme while leveling, questing, exploring map and so on.