I got the same problem with my PC. I'm running a Nvidia card (1650ti) and I know it's good enough for D2. As a matter of fact, for the last 4 years it's worked fine. I think it's something they got in their end and the do have it enumerated on their latest known PC issues list.
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Yup ain't no way my 3060ti and 5700X combo should be getting less FPS than my 1660Ti i7-10700F combo lol.