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perf(desktop): use useDeferredValue for Transcript items #2956

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perf(desktop): use useDeferredValue for Transcript items #2956

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10 changes: 8 additions & 2 deletions desktop/frontend/src/App.tsx
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import { useCallback, useEffect, useMemo, useRef, useState } from "react";
import { useCallback, useDeferredValue, useEffect, useMemo, useRef, useState } from "react";
import type { CSSProperties, KeyboardEvent, PointerEvent as ReactPointerEvent } from "react";
import {
SquarePen,
Expand Down Expand Up @@ -257,6 +257,12 @@ export default function App() {
todos.length > 0 &&
todos.some((t) => t.status !== "completed");

// useDeferredValue lets React prioritise Composer input (high-priority) over
// Transcript re-renders (low-priority) during streaming. When a keystroke
// and a transcript update collide, the keystroke is processed immediately
// and the transcript re-render is deferred to idle time.
const deferredItems = useDeferredValue(state.items);

useEffect(() => {
if (!pendingPlanRevision || state.running) return;
const text = pendingPlanRevision;
Expand Down Expand Up @@ -927,7 +933,7 @@ export default function App() {
<span className="loading-screen__text">{t("common.loading")}</span>
</div>
) : (
<Transcript items={state.items} live={state.live} footerHeight={footerHeight} onPrompt={send} onRewind={rewind} />
<Transcript items={deferredItems} live={state.live} footerHeight={footerHeight} onPrompt={send} onRewind={rewind} />
)}
</main>

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