Relative System Specs:
i7-2700k @ 4.8GHz
GTX 580
8GB 1600 RAM
1TB WD 7200 RPM HDD
Alright so here's the issue I'm having. I normally play WoW with on completely max detail; that is to say 8x multisampling, 16x texture filtering, everything on ultra etc etc. The lowest I ever get in a 25-man raid is around 40 FPS, and that's during things like Molten Seeds on Ragnaros. Recently we've been spending a lot of time on Yor'sahj, and the black phases with forgotten ones absolutely tear my FPS apart. I'm getting anywhere from 15-20 FPS during those phases, and while to some people that's perfectly playable... it absolutely is not to me.
My current theory is that it's a common addon causing the issue since a lot of my guild members have really bad spikes at that same point. At first, I thought it was just recount acting up, so I disabled it; that got me anywhere from 3-5 more FPS, so that's obviously not it. I then attempted to play on the absolute minimum settings, with recount off, and only saw about 7-8 more FPS on top of the 3-5 I gained from recount. Overheating came to mind, but my temps are always in the low 50s during raids so that's not it either.
The symptoms point towards my CPU choking from the AOE and spell effects, but I really can't imagine that being the case. Aside from the 3930k or 3960k, my CPU is basically the best option, AND it's overclocked to 4.8GHz. This fight is either horribly coded, it's a common addon causing the issue, or my CPU is degrading (the latter seems unlikely due to this being the only instance of poor performance).
MY QUESTION: Is anyone else having this problem that plays WoW on a PC that isn't branded with the Fisher Price decal?
IF YES: Have you tried troubleshooting? Disabling any addons? Any suggestions to offer at all?