diff --git a/backend/routes/osm.py b/backend/routes/osm.py
index 2c7375b..ddec009 100644
--- a/backend/routes/osm.py
+++ b/backend/routes/osm.py
@@ -156,8 +156,8 @@ async def _fetch_and_store_tile(poi_type, x, y):
 
 # ------------------------------------------------------------------
 # GET /pois — OSM + Community-Pins
-# fast=true: nur DB, kein Overpass-Fetch (sofortantwort)
-# fast=false (default): fetcht Overpass wenn Tiles veraltet sind
+# Gibt sofort DB-Daten zurück. Stale Tiles werden im Hintergrund
+# nachgeladen — beim nächsten Scan des gleichen Bereichs sind sie frisch.
 # ------------------------------------------------------------------
 @router.get('/pois')
 async def get_pois(
@@ -167,6 +167,7 @@ async def get_pois(
     north: float = Query(...),
     east:  float = Query(...),
     fast:  bool  = Query(False),
+    background_tasks: BackgroundTasks = None,
     user = Depends(get_optional_user),
 ):
     result = []
@@ -177,8 +178,11 @@ async def get_pois(
         stale = _stale_tiles(type, tiles)
 
         if stale and not fast:
-            await asyncio.gather(*[_fetch_and_store_tile(type, x, y) for (x, y) in stale])
-            fetched_fresh = True
+            # Hintergrund-Fetch: Antwort kommt sofort, Overpass lädt asynchron
+            async def _bg_fetch():
+                for (x, y) in stale:
+                    await _fetch_and_store_tile(type, x, y)
+            background_tasks.add_task(_bg_fetch)
 
         with db() as conn:
             reported = {