This began a few months back but has been getting increasingly worse. I'm on an Alienware PC with an GeForce RTX 2060 and an AMD Ryzen 7 5800 and my frames in D2 have been dropping super hard. It was never an issue before, but my frames now tend to cap around 70-90 with super low dips into the 40's when doing pvp and even pve.
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I've been having fps issues as well. Hope Bungie knows its a problem and fix it soon.