Memories DLC seems to be very unoptimized not because of grass density but because of map structure. If you accept too many jobs at once and don't complete them it slows down to a crawl. It's evident because my GPU usage remains the same, it doesn't speed up when looking at the ground and lowering settings doesn't change things.
Just a heads up.
Edit: Even after map has no active quests it can still be slow, oh well.
Diego0920
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