Its Not an AMD system Problem. Chuck any Nvidia card in your machine and watch the frame rate climb. "forced multithreading" is a hangover from the console versions, if Bungo knew how to program correctly and made that function work as intended, everyone would benefit CPU vendor agnostic. D2 PC runs on at Max 4 cores at any given time from memory. Your problem, like many users here is that Bungo programed this game on a sh1tty custom version of DX11. Nvidia cards handle this fine because they rely on software to tell the hardware what to do. See HardwareUnboxeds videos on this, its why Nvidia cards require better CPUs. AMD Gpus have been going bare metal focused for nearly 10 years at this point. It's the way everything's going: Vulkan(Used to be Mantle), DX12. But Bungo programmed the game like it was 2007, despite being released 10 years later. As of Currently Bungo has no idea how to fix this because the original team that did the PC port, Beenox Studios is no longer accessible to them re: split with Activision. Bungo is incapable/Unwilling to do anything because they've only ever heard of Nvidia as a GPU vendor, and think we should all just give Jensen money for his leather jackets. A possible solution is that Bungo pull their heads out their asses and give us access to the Vulkan version they built for Google Stadia, This would also let Linux users play the game without getting insta-banned. But Bungo, so not likely.