I upgraded from a gtx 1060 to an rx 5600 xt. I've uninstalled all previous drivers lowered all settings to the lowest its not a cpu bottleneck. I am getting fps in the 40s to 50s in some areas where i used to get 60 to 70. It's something wrong with the game and the 5600 xt I used to get much higher fps on the 1060 and the 5600 xt is a way better card.
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https://www.bungie.net/ru/Forums/Post/257720558?sort=0&page=0
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Its the game not your card but try installing driver version 20.2.2 from the amd website I'm using the 5700xt and that driver is working well so far. I to was also hit with this bug.