There are so many users on this forum with the same FPS issue but you are not doing shit, come on already, START READING THE FORUM POSTS. The FPS is low and not changing no matter the graphics settings or resolution, they all tried every POSSIBLE fix but it's not working. The game was working just fine before so this is PROOF that it is on destiny side.
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Have you tried reinstalling your OS from scratch? Or, if you have got a backup of your OS, to restore it from that backup and see if anything changes?