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The hash function may not matter for overall git performance in virtually all dev machine setups, but there will be a (maybe tiny, maybe larger, depending on the repo and disk io speed) difference in cpu utilization and heat generation, right?

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That's a silly thing to worry about when you're developing Ruby or Java applications. My PC boots faster than the Rails console or IntelliJ.

JRuby?

The broader point is this: code repositories are not the only things git is used for.

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