Note that we tested the ROG Ally in DX12 mode, which is broken and doesn't render shadows and volumetric fog. This resulted in performance that's higher than what you'd expect. If you want an apples to apples comparison with the Steam Deck, check out ROG Ally's DX11 (Vulkan) mode performance numbers, which are noticeably lower than out-of-box performance and closer to what the game would perform if the visuals weren't messed up by default.
Minimum FPS