diff --git a/apps/web/src/components/chat/CommandOutputPanel.tsx b/apps/web/src/components/chat/CommandOutputPanel.tsx
index bfa98583a843..fa28d83ba19a 100644
--- a/apps/web/src/components/chat/CommandOutputPanel.tsx
+++ b/apps/web/src/components/chat/CommandOutputPanel.tsx
@@ -1,6 +1,6 @@
 import type { EnvironmentId, ThreadId, TurnItemId } from "@t3tools/contracts";
 import { TERMINAL_PALETTES, terminalOutputSpans } from "@t3tools/shared/terminalOutput";
-import { useLayoutEffect, useMemo, useRef } from "react";
+import { useLayoutEffect, useRef } from "react";
 
 import { useTheme } from "../../hooks/useTheme";
 import { useServerConfigs } from "../../state/entities";
@@ -22,6 +22,13 @@ export function useCommandOutputStreaming(environmentId: EnvironmentId): boolean
  * shows its final output. Mount it only when `useCommandOutputStreaming` holds.
  * It subscribes only while mounted, so collapsed rows and other threads receive nothing.
  */
+// Parsing ANSI output is linear in its length, and the compiler would redo it on
+// every render because the layout effect runs after it.
+function useTerminalOutputSpans(text: string, resolvedTheme: keyof typeof TERMINAL_PALETTES) {
+  "use memo";
+  return terminalOutputSpans(text, TERMINAL_PALETTES[resolvedTheme]);
+}
+
 export function CommandOutputPanel(props: {
   readonly environmentId: EnvironmentId;
   readonly threadId: ThreadId;
@@ -38,10 +45,7 @@ export function CommandOutputPanel(props: {
   const followRef = useRef(true);
   const text = data?.output.text ?? "";
   const { resolvedTheme } = useTheme();
-  const spans = useMemo(
-    () => terminalOutputSpans(text, TERMINAL_PALETTES[resolvedTheme]),
-    [text, resolvedTheme],
-  );
+  const spans = useTerminalOutputSpans(text, resolvedTheme);
 
   // This panel only re-renders when its output changes, so keep the end in view after each.
   useLayoutEffect(() => {