Pressing shift+PGUP or whatever the hell it is turn on features that turn AA right back off. Unless someone corrects me,...your FPS went back up bc you just turned AA back off.
EDIT: I would guess that with all of those setting cranked up your video card is having a hard time rendering the wake on the bow of your boat. Try turning Anisotropic filtering down and the other setting to off. Back your AA down to 4x AA and take another look. If the problem goes away start turning the setting up one by one to see how far you can push it before it starts to puke.
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Your sister swims towards troop ships.
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