perf(UnderlineNav): eliminate cascading render on mount#7875

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mattcosta7 wants to merge 11 commits into

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perf/underlinenav-render-cascade

Commits on May 22, 2026

perf(UnderlineNav): measure items once from the parent
mattcosta7
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perf(UnderlineNav): consolidate overflow state into a single object
mattcosta7
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perf(UnderlineNav): memoize Item and stabilize context value
mattcosta7
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perf(UnderlineNav): lift aria-current swap out of render phase
mattcosta7
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test(UnderlineNav): cover architecture, structure, and perf changes
mattcosta7
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perf(UnderlineNav): collapse nested updates into one effect, one commit
mattcosta7
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perf(UnderlineNav): key width and child lookups by React element key
mattcosta7
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perf(UnderlineNav): move overlay anchoring into a layout effect
mattcosta7
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style(UnderlineNav): bound the measurement loop by validChildren.length
mattcosta7
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fix(UnderlineNav): use safe keys for children signature and menu items
mattcosta7
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perf(UnderlineNav): use the key Map in the aria-current swap pass
mattcosta7
committed