Massive FPS increase with Resolution decrese (?)

[Shadylurker]

I was just curious why this is, I know in theory why, But is it known why this makes such a massive difference in this game?


EDIT: Whoa quick update i didnt enjoy playing windowed with 1024x768 so i changed the ini to almost full screen window, my fps full screen were 20 over water. with the only thing changed was window mode im over 100fps now in the same spot!

EDIT 2: Problem is fixed by forcing my GPU to max clocks. Game would not make my GPU move from it's idle clocks (300/300mhz) Now that my GPU runs at max clocks (925/1125) all the time the game runs great.