Image to Image processing Ultra ultra wide

I am doing a project where I have 3 screens that show an ultra ultra wide photo that is 11520 by 2160 pixel in size. I am tryin to make a custom node where the image will be processed, but no matter how complex I do the prompt, and negatives, the outcome is always crappy. Does anyone have a workflow that handles huge images?

Thank you in advance

By the way. I have an M3 Ultra with 256GB RAM, so the workflow should be for MPS.