Specs? Doa should work well. The build i made for my ex ran/runs doa6 well, and it had an rx580 and ryzen 5 2600, which is pretty modest. Just make sure your drivers are fully up to date.
There was a certain point in time when the windows drivers didnt work for doa6, but i thought they fixed that. Its been ages since i played doa6 on windows so I'm not too sure if its a problem anymore. Did you test doa5: Core Fighters?....also i highly recommend installing msi afterburner so you can use the rivatuner statistics server overlay to figure out whats limiting your frames
I've got no issue running 6 on PC but I got an Nvidia GPU. Might just be an issue with your PC as it seems others with the 5600XT can run it just fine.
The AMD radeon software took off the GPU workload option. Idk if I can change the gpu option. Unless it involves something else. Also afterburner's not loading for me. Sorry. This PC stuff's a headache. Ngl.
Try disabling the Intel Graphics iGPU in Device Manager->Display adapters->right-click on it and Disable; it's useless anyway with a dedicated GPU in the PC and you avoid conflicts between the two this way.