Okay, I would have posted this in the 'Interface & Macros' forum, since I though it was an addon causing the problems, but I've figured out, it isn't.
So, my problem is:
In every raid (Both 10 and 25 man), my FPS drops from 40-60 down to something in between 0-1... I've disabled all my addons, graphics on the lowest and it's still happening.
This make me think it's either my computer or my WoW installation that's messed up.
My computer should easily be able to handle WoW, and I run with about 60 FPS on maxed settings, in a non-raiding environment..
OS: Windows 7 Home Premium x64
CPU: Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz (8 CPUs)
Screen size: 1920x1080 (32bits)
Video card: NVIDIA GeForce GT 230
RAM: 8192 MB
This has been going on for months and I haven't been able to fix it. I'm pretty good at searching information, but I've failed on this particular topic. :/
So now I've come to MMO Champion, in hope that someone will have the answer to my prayer.
What could I possibly do to fix it?
I'm gonna reinstall the game in a couple of days, unless someone here manage to help me out.