Now, this is something weird that has happened to me lately (past ~10 days) and I've tried multiple things to solve it; ever so randomly my FPS drops to 30-35 and stays there until I restart the client. It doesn't matter if I stand in the middle of Orgrimmar or look up into the sky; it's 30-35 FPS all the time, everywhere. The only thing that resolves the issue is to restart the client altogether.
My computer is in my signature. I'm running WoW at max (ultra) at 1080 (windowed) with a moderate amount of addons. I've have Firefox 4 (1-2 tabs, Youtube, mmo-champ, guild forum), Fraps (not recording, only to check FPS) and some other stuff like iTunes running when this have happened. Fraps and iTunes haven't been running necessarily every time it has happened though. Usually I'm anywhere around 70-180 fps in raids/org.
My first thought was an addon, but after giving it some thought it seems unreasonable. I tried disabling all addons but since the issue pops up completely at random it's hard to tell. I haven't been able to replicate the issue with addons disabled, but have only tried for ~an hour and since it has happened maybe 8 times in the past 10 days it's hard to tell.
Could it be some cache file being corrupt? Another gamefile being corrupt? I'd like to try and avoid a clean install because.. well.. hassle.
Greatly appreciate any help,
/Marest