Graphical effects have never been the problem. They’re completely irrelevant and not even sort of part of the discussion.
What? This whole topic is about the lower quality of MK1 on the switch. How is the CPU involved in the graphics of MK1? You’ll need to share a source that this is the problem.
CPU performance is exactly the entire problem, and yes, you absolutely do have to make fundamental changes to make it functional. The CPU is the reason the majority of last gen games are straight up impossible to port in any context, and current gen games are much worse.
Please share a source, or at least a detailed description of what exactly the CPU is too slow for to run MK1 with higher quality. It sure as hell isn’t involved in shader execution, which is where most of the graphical fidelity comes from (if you’re developing a game post 2000).