Eh, 30 fps for a frenetic shooter like this is still pretty not great.

I can get a solid 45 fps on a Deck on Cyberpunk 2077, similar graphical fidelity imo, especially at a lower end output resolution as with a Deck.

The whole problem, from a 'running on a Deck' perspective, is that Doom Dark Ages is built on idTech 8... which forces raytracing.

They would have to refactor the whole game / build a whole new variant of the engine that based off the Vulkan-Base branch of idTech8, that has... you know, a lighting engine that can look at least comparable without relying on realtime raytracing.

Not just do some optimization tweaks.