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Render Performance

Edit any cell and watch the yellow render counters: only that cell and its column total re-render, however many rows there are.

Rows:

What this shows

Every field is its own Jotai atom, so typing in one cell re-renders that cell and its column total. Nothing else re-renders, whether the table has 100 rows or 500. See Performance.

Each column total watches only its column with useFieldArrayColumnWatch.
The array has no validate, which would subscribe it to every value.
skipValuesObserver turns off whole-form value tracking, since nothing here uses useFormValues or useIsDirty.

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What this shows