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How to modify stages? - A Question for Ultimate Marvel vs Capcom 3

Question Answered but Unsolved

This Question has been answered but no solution has been chosen. You can still post your own answer to help the submitter.
I wanted to edit the stages in the game that have a lot going on in them to clear them up, like the cleared up Asgard; Sea of Space by Tabs, so those specific stages won't cause the game to slow down for me whenever I play on them. Only thing is that I have no idea as to how to do this.