I get the same issue. Is your 60fps only when in game? (crucible, gambit, on planet) And then in menu or loading screen higher? I get 130-144fps in loading menu.
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I've been having the exact same problems in loading screens I get 240 fps, when i switch to chracter inventory it bounces down to 140, in the tower I get 90 and flipping through menus is -100. I can legit stare at the crucible directory and get -60frames. Same thing happen to you?