This is my old WF for image upscaling.

I have added a deep Cache to the iteractive upscale.... and I think it works pretty well in this case....

You should start with small zooms to see if your GPU is up to the task.

Link do deep cache: https://gist.github.com/laksjdjf/435c512bc19636e9c9af4ee7bea9eb86, im not a author (https://arxiv.org/abs/2312.00858)

Link to my complete comfyui ziped folder:  https://huggingface.co/datasets/Aderek514/comfyui

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