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Is your assertion that it takes more time for a CPU to read values out of a 30 byte struct and do a couple shifts and branches than to parse a JSON representation?

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The JSON needs to be parsed only once. Then it is (or can be) just any object to your liking.

JSON is for storing data as text. Not work with that text all the time.

It's not just reading, you need to process the data to get castling availability, en passant target etc.

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