I found another game with same issues, it is The Division 2. Same problems with my RX 5700 XT. In the open world areas FPS tanks from usual 100-100 FPS to 50-65 FPS, GPU usage are 60-70%, as in Destiny 2, but there's solution. I just changed to DX12 render and vualia, everything works as it should, all areas over 100 FPS, 97-99% GPU usage. I suspect there is something wrong with DX11 in either drivers, or Windows 2004 build. I don't have any other DX11 game to test. Both CoDs, Modern Warfare and Black Ops, use DX12, same with Forza Horizon 4 or Forza Motorsport 7, The Division 2 with DX12 also works great. Only one game works bad and it's Destiny 2 with DX11. I want to stress that Division 2 with DX11 also works like ass on RX 5700 XT as I mentioned.