I updated to these drivers and I am experiencing the low FPS as suggested below. Previous to the update, I had no issues with frame rate in a 25man being at max settings.
Low FPS - NVIDIA 196.75 drivers
Quote from: Datth (Source)We're getting reports where users are getting intermittent low FPS after installing these drivers. It seems that it is related to the fan control included in these drivers not working correctly and is causing the video card to overheat on 3D applications. This will affect Warcraft 3, World of Warcraft and StarCraft 2 Beta. Please uninstall the drivers and revert back to the older ones.