diff --git a/backend/src/Controller/SpotScoreController.php b/backend/src/Controller/SpotScoreController.php
index 672b8a4..8ba6982 100644
--- a/backend/src/Controller/SpotScoreController.php
+++ b/backend/src/Controller/SpotScoreController.php
@@ -20,6 +20,46 @@ class SpotScoreController extends AbstractController
         private Connection             $connection,
     ) {}
 
+    /**
+     * GET /api/spots/overview
+     *
+     * Retourne tous les spots avec leur dernier score en UNE seule requête.
+     * Remplace les N appels individuels à /api/spots/{id}/score pour le rendu
+     * initial de la carte.
+     *
+     * Cache HTTP 30 min (scores mis à jour au max 1-2×/jour par ingestion).
+     */
+    #[Route('/overview', name: 'overview', methods: ['GET'])]
+    public function overview(): JsonResponse
+    {
+        $rows = $this->connection->fetchAllAssociative(
+            "SELECT
+                cp.id::text,
+                cp.name,
+                cp.type,
+                cp.region,
+                ST_X(cp.geometry::geometry)  AS longitude,
+                ST_Y(cp.geometry::geometry)  AS latitude,
+                ist.score,
+                ist.level,
+                ROUND(CAST(ist.distance_to_nearest_sargassum AS numeric), 2) AS distance_km
+             FROM coastal_point cp
+             LEFT JOIN LATERAL (
+                 SELECT score, level, distance_to_nearest_sargassum
+                 FROM impact_score
+                 WHERE coastal_point_id = cp.id
+                 ORDER BY timestamp DESC
+                 LIMIT 1
+             ) ist ON true
+             ORDER BY cp.name"
+        );
+
+        $response = $this->json($rows);
+        $response->headers->set('Cache-Control', 'public, max-age=1800, stale-while-revalidate=300');
+
+        return $response;
+    }
+
     /**
      * GET /api/spots/{id}/score
      *
diff --git a/frontend/src/api/client.js b/frontend/src/api/client.js
index 09d4a03..1bc8086 100644
--- a/frontend/src/api/client.js
+++ b/frontend/src/api/client.js
@@ -25,9 +25,9 @@ async function post(path, body) {
 
 export const api = {
   spots: {
-    list: ()       => get('/spots'),
-    get:  (id)     => get(`/spots/${id}`),
-    score: (id, at) => get(`/spots/${id}/score`, { at }),
+    overview: ()       => get('/spots/overview'),   // tous les spots + score en 1 requête cachée
+    get:      (id)     => get(`/spots/${id}`),
+    score:    (id, at) => get(`/spots/${id}/score`, { at }),
   },
   observations: {
     list: (bbox, date, source) => get('/observations', { bbox, date, source }),
diff --git a/frontend/src/components/Map/SargassesMap.jsx b/frontend/src/components/Map/SargassesMap.jsx
index 2af2249..8b6514c 100644
--- a/frontend/src/components/Map/SargassesMap.jsx
+++ b/frontend/src/components/Map/SargassesMap.jsx
@@ -179,8 +179,9 @@ function SpotMarker({ level, scoreValue, scoreDist, isSelected, name }) {
 
 export default function SargassesMap({ onSpotSelect, selectedSpotId, activeStep, flyToTarget }) {
   const mapRef = useRef(null);
+  // spots : [{ id, name, type, region, longitude, latitude, score, level, distance_km }]
   const [spots,        setSpots]        = useState([]);
-  const [spotScores,   setSpotScores]   = useState({});
+  const [spotScores,   setSpotScores]   = useState({});  // id → { level, value, distance }
   const [viewState,    setViewState]    = useState(INITIAL_VIEW);
   const [layerOpacity, setLayerOpacity] = useState(1);
   const [mapStyle,     setMapStyle]     = useState(null);   // null = style not yet ready
@@ -212,28 +213,28 @@ export default function SargassesMap({ onSpotSelect, selectedSpotId, activeStep,
     return () => ctrl.abort();
   }, []);
 
-  // Load coastal spots once
+  // Charge tous les spots + scores en UNE requête (cachée 30 min côté serveur)
   useEffect(() => {
-    api.spots.list()
-      .then(data => setSpots(Array.isArray(data) ? data : (data['hydra:member'] ?? data.member ?? [])))
+    api.spots.overview()
+      .then(rows => {
+        if (!Array.isArray(rows)) return;
+        setSpots(rows);
+        // Pré-remplir spotScores depuis la même réponse — aucune requête supplémentaire
+        const scores = {};
+        rows.forEach(r => {
+          if (r.level) {
+            scores[r.id] = {
+              level:    r.level,
+              value:    r.score   ?? 0,
+              distance: r.distance_km ?? null,
+            };
+          }
+        });
+        setSpotScores(scores);
+      })
       .catch(console.error);
   }, []);
 
-  // Load scores progressively for marker colors
-  useEffect(() => {
-    if (!spots.length) return;
-    spots.forEach(s => {
-      api.spots.score(s.id)
-        .then(d => {
-          const level    = d?.score?.level;
-          const value    = d?.score?.value ?? 0;
-          const distance = d?.score?.distance ?? null;
-          if (level) setSpotScores(prev => ({ ...prev, [s.id]: { level, value, distance } }));
-        })
-        .catch(() => {});
-    });
-  }, [spots]);
-
   // Fade transition on step change
   useEffect(() => {
     setLayerOpacity(0);