Strange FPS fluctuations

Hi Guys

I dont know if anyone else is getting these issues. My game FPS fluctuates at random times. 95% of the time is fluctuates while I am in the Hour of Twilight dungeon.

No other game has any FPS issues and in general WoW has no issues.

Running the game on Ultra settings with the following spec machine:

Windows 7 64-bit
WoW 32-bit Client
Intel i5 2500K 3.3GHz
16GB RAM
AMD HD6990 Graphics card. (Driver Version: 12.8
Boot Drive: 120GB SSD
Data Drive: 1TB Sata-III HDD
Kaspersky AV

 
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