Vertical sync is turned off both in game and through Nvidia control panel.
Usually the first time I hop in game it works fine for the first 5 minutes or so, then will suddenly dip into the single digits for no reason. It then occasionally "pops" back into normal FPS, but eventually gets stuck in single digits until I restart the game. If I quit a mission and restart it, more often than not it will START in "low fps" mode right from the beginning.
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