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Optimize TreeView typeahead with startTransition to prevent input lag #7410

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Optimize TreeView typeahead with startTransition to prevent input lag #7410

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7d78907
Initial plan
Copilot Jan 2, 2026
07b0167
Add startTransition to TreeView typeahead for better performance
Copilot Jan 2, 2026
c6e48c4
Add changeset for TreeView typeahead performance optimization
Copilot Jan 2, 2026
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7 changes: 7 additions & 0 deletions .changeset/eight-hats-laugh.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
---
'@primer/react': patch
---

perf(TreeView): Optimize typeahead with startTransition to prevent input lag

Wrapped the expensive typeahead search operation in `startTransition` to mark it as low-priority, keeping keystroke handling responsive while deferring the focus search. This improves performance on large trees with thousands of items.
7 changes: 5 additions & 2 deletions packages/react/src/TreeView/useTypeahead.ts
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@@ -1,4 +1,4 @@
import React from 'react'
import React, {startTransition} from 'react'
import useSafeTimeout from '../hooks/useSafeTimeout'
import {getAccessibleName} from './shared'
import {useTreeItemCache} from './useTreeItemCache'
Expand Down Expand Up @@ -71,7 +71,10 @@ export function useTypeahead({containerRef, onFocusChange}: TypeaheadOptions) {

// Update the existing search value with the new key press
searchValue.current += event.key
focusSearchValue(searchValue.current)
// Defer the expensive search operation to avoid blocking user input
startTransition(() => {
focusSearchValue(searchValue.current)
})

// Reset the timeout
safeClearTimeout(timeoutRef.current)
Expand Down