diff --git a/config.py b/config.py
index cac39c6..ddad0d9 100644
--- a/config.py
+++ b/config.py
@@ -320,7 +320,7 @@ YOUTUBE_API_KEY = os.getenv('YOUTUBE_API_KEY', '')
 # ==========================================
 # 系統版本與路徑
 # ==========================================
-SYSTEM_VERSION = "V10.102"
+SYSTEM_VERSION = "V10.103"
 LOG_FILE_PATH = os.path.join(BASE_DIR, 'logs/system.log')
 public_url = PUBLIC_URL  # 用於模板顯示
 
diff --git a/routes/edm_routes.py b/routes/edm_routes.py
index c88a182..6d8bf6f 100644
--- a/routes/edm_routes.py
+++ b/routes/edm_routes.py
@@ -27,6 +27,9 @@ sys_log = SystemLogger("EDMRoutes").get_logger()
 # Blueprint 定義
 edm_bp = Blueprint('edm', __name__)
 
+_PROMO_DASHBOARD_CACHE = {}
+_PROMO_DASHBOARD_CACHE_MAX = 32
+
 
 # ==========================================
 # 輔助函數
@@ -62,11 +65,51 @@ def load_scheduler_stats():
     return {}
 
 
+def _get_promo_dashboard_fingerprint(session, page_type):
+    """取得促銷資料指紋，用於判斷快取是否仍可復用。"""
+    max_id, max_crawled_at, row_count = session.query(
+        func.max(PromoProduct.id),
+        func.max(PromoProduct.crawled_at),
+        func.count(PromoProduct.id)
+    ).filter(PromoProduct.page_type == page_type).one()
+    return (
+        max_id or 0,
+        max_crawled_at.isoformat() if max_crawled_at else '',
+        row_count or 0
+    )
+
+
+def _get_promo_dashboard_cache_key(session, page_type, sort_by, order, requested_slot):
+    """建立 dashboard data 快取鍵；日期/小時避免自動時段跨時段後仍命中舊首屏。"""
+    now_taipei = datetime.now(TAIPEI_TZ)
+    auto_slot_bucket = now_taipei.strftime('%Y-%m-%d-%H') if not requested_slot else ''
+    return (
+        page_type,
+        sort_by,
+        order,
+        requested_slot or '',
+        auto_slot_bucket,
+        _get_promo_dashboard_fingerprint(session, page_type)
+    )
+
+
+def _remember_promo_dashboard_data(cache_key, data):
+    """保留少量活動 dashboard data，避免常用時段每次重算。"""
+    if len(_PROMO_DASHBOARD_CACHE) >= _PROMO_DASHBOARD_CACHE_MAX:
+        _PROMO_DASHBOARD_CACHE.pop(next(iter(_PROMO_DASHBOARD_CACHE)))
+    _PROMO_DASHBOARD_CACHE[cache_key] = data
+
+
 def _build_promo_dashboard_data(session, page_type, page_name, sort_by, order, requested_slot=None):
     """
     通用的促銷儀表板數據建構函數
     用於 edm 和 festival 兩種頁面類型
     """
+    cache_key = _get_promo_dashboard_cache_key(session, page_type, sort_by, order, requested_slot)
+    cached_data = _PROMO_DASHBOARD_CACHE.get(cache_key)
+    if cached_data is not None:
+        return cached_data
+
     # 1. 基礎統計
     last_update = session.query(PromoProduct.crawled_at).filter(
         PromoProduct.page_type == page_type
@@ -288,7 +331,7 @@ def _build_promo_dashboard_data(session, page_type, page_name, sort_by, order, r
             slot_stats[slot]['on_shelf'] = on_shelf_count
             slot_stats[slot]['delisted_total'] = delisted_total_count
 
-    return {
+    data = {
         'sorted_grouped_items': sorted_grouped_items,
         'slot_stats': slot_stats,
         'items_in_batch': items_in_batch,
@@ -297,6 +340,8 @@ def _build_promo_dashboard_data(session, page_type, page_name, sort_by, order, r
         'active_tab': active_tab,
         'current_batch_id': current_batch_id
     }
+    _remember_promo_dashboard_data(cache_key, data)
+    return data
 
 
 # ==========================================