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a lot of the re-render "fixes" people are sharing have no perceivable impact other than seeing less of the highlights flashing

I still find it useful to count renders as a means to identify and reduce needless work. Problem is when the default "solution" is memoization and not better composition.

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Removing a setState in an effect will remove 100% of the "unnecessary renders" triggered by the effect, but the root issue isn't the render, it's the unnecessary update.