diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 0000000..470eab8
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2024-10-01 - O(N*M) Lookup Optimization
+**Learning:** Found O(N*M) time complexity loop where `Array.map` contained an `Array.find` inside a React useMemo hook (`routeStopIds.map((id) => pins.find(...))`). When replacing array lookups with memoized Maps (`useMemo`) in React components, do not use the memoized Map within imperative external bindings or global test hooks (e.g., `window.__TEST_HOOKS`, `window.__MAP_APP_TEST`) initialized outside the React render cycle, as this can introduce stale closures. Retain the original array lookups (e.g., `array.find()`) for those specific external bindings.
+**Action:** Replace `Array.map` with `Array.find` using a `Map` created via `useMemo` for O(1) lookups in the component, but retain `pins.find` in `window.__MAP_APP_TEST`.
diff --git a/components/territory/territory-workspace.tsx b/components/territory/territory-workspace.tsx
index 6d2ff49..259abd4 100644
--- a/components/territory/territory-workspace.tsx
+++ b/components/territory/territory-workspace.tsx
@@ -570,13 +570,20 @@ export function TerritoryWorkspace({ orgSlug, initialDashboard, territoryConfig
   const mobileViewAutoSwitchedRef = useRef(initialPreferListView);
 
   const pins = data.pins;
-  const selectedPin = useMemo(() => pins.find((pin) => pin.id === selectedId) ?? null, [pins, selectedId]);
+  const pinsById = useMemo(() => {
+    const map = new Map<string, TerritoryAccountPin>();
+    for (const pin of pins) {
+      map.set(pin.id, pin);
+    }
+    return map;
+  }, [pins]);
+  const selectedPin = useMemo(() => (selectedId ? pinsById.get(selectedId) ?? null : null), [pinsById, selectedId]);
   const routeStops = useMemo(
     () =>
       routePlanningEnabled
-        ? routeStopIds.map((id) => pins.find((pin) => pin.id === id)).filter((pin): pin is TerritoryAccountPin => Boolean(pin))
+        ? routeStopIds.map((id) => pinsById.get(id)).filter((pin): pin is TerritoryAccountPin => Boolean(pin))
         : [],
-    [pins, routePlanningEnabled, routeStopIds],
+    [pinsById, routePlanningEnabled, routeStopIds],
   );
   const mappablePinCount = useMemo(() => pins.filter(hasUsableCoordinates).length, [pins]);
   const activeFilterCount = Object.values(filters).filter(Boolean).length;