diff --git a/frontend/src/components/ClusteringView.tsx b/frontend/src/components/ClusteringView.tsx
index 3b9bebe..fdf2e93 100644
--- a/frontend/src/components/ClusteringView.tsx
+++ b/frontend/src/components/ClusteringView.tsx
@@ -93,10 +93,21 @@ function hexToRgba(hex: string, alpha = 255): [number, number, number, number] {
 
 // ─── Composant principal ──────────────────────────────────────────────────────
 
+// Persistence des paramètres dans localStorage
+const LS_KEY = 'soc_clustering_params';
+function loadParams() {
+  try {
+    const s = localStorage.getItem(LS_KEY);
+    if (s) return JSON.parse(s) as { k: number; hours: number; sensitivity: number };
+  } catch { /* ignore */ }
+  return { k: 20, hours: 24, sensitivity: 1.0 };
+}
+
 export default function ClusteringView() {
-  const [k, setK] = useState(20);
-  const [hours, setHours] = useState(24);
-  const [sensitivity, setSensitivity] = useState(1.0);
+  const init = loadParams();
+  const [k, setK] = useState(init.k);
+  const [hours, setHours] = useState(init.hours);
+  const [sensitivity, setSensitivity] = useState(init.sensitivity);
   const [data, setData] = useState<ClusterResult | null>(null);
   const [loading, setLoading] = useState(false);
   const [computing, setComputing] = useState(false);
@@ -117,9 +128,15 @@ export default function ClusteringView() {
     maxZoom: 6,
   });
 
+  // ── Persistence des paramètres ──────────────────────────────────────────
+  useEffect(() => {
+    localStorage.setItem(LS_KEY, JSON.stringify({ k, hours, sensitivity }));
+  }, [k, hours, sensitivity]);
+
   // ── Chargement / polling ─────────────────────────────────────────────────
 
   const fetchClusters = useCallback(async (force = false) => {
+    if (pollRef.current) { clearTimeout(pollRef.current); pollRef.current = null; }
     setLoading(true);
     setError(null);
     try {
@@ -128,7 +145,7 @@ export default function ClusteringView() {
       });
       if (res.data.status === 'computing' || res.data.status === 'idle') {
         setComputing(true);
-        // Polling
+        // Polling toutes les 3s
         pollRef.current = setTimeout(() => fetchClusters(), 3000);
       } else {
         setComputing(false);
@@ -139,10 +156,10 @@ export default function ClusteringView() {
           const ys = res.data.nodes.map(n => toWorld(n.pca_y));
           const minX = Math.min(...xs), maxX = Math.max(...xs);
           const minY = Math.min(...ys), maxY = Math.max(...ys);
-          const pad = 0.18;  // 18% de marge de chaque côté
+          const pad = 0.18;
           const fitW = (maxX - minX) * (1 + 2 * pad) || WORLD;
           const fitH = (maxY - minY) * (1 + 2 * pad) || WORLD;
-          const canvasW = window.innerWidth - 288 - (selected ? 384 : 0); // panel + sidebar
+          const canvasW = window.innerWidth - 288 - (selected ? 384 : 0);
           const canvasH = window.innerHeight - 60;
           setViewState(v => ({
             ...v,
@@ -160,7 +177,7 @@ export default function ClusteringView() {
     } finally {
       setLoading(false);
     }
-  }, [k, hours]);
+  }, [k, hours, sensitivity]); // sensitivity inclus pour éviter la stale closure
 
   useEffect(() => {
     fetchClusters();
@@ -387,9 +404,9 @@ export default function ClusteringView() {
             Afficher les arêtes
           </label>
           <button onClick={() => fetchClusters(true)}
-            disabled={loading || computing}
+            disabled={loading}
             className="w-full py-2 bg-accent-primary text-white rounded text-sm font-medium hover:opacity-90 disabled:opacity-50">
-            {computing ? '⏳ Calcul…' : loading ? '⏳ Chargement…' : '🔄 Recalculer'}
+            {computing ? '⏳ Calcul en cours…' : loading ? '⏳ Chargement…' : '🔄 Recalculer'}
           </button>
         </div>
 
@@ -442,12 +459,12 @@ export default function ClusteringView() {
       {/* ── Canvas WebGL (deck.gl) ── */}
       <div className="flex-1 relative overflow-hidden">
 
-        {/* Animation de calcul — remplace le canvas pendant le traitement */}
-        {(computing || loading) && (
-          <div className="absolute inset-0 z-20 flex flex-col items-center justify-center bg-background">
+        {/* Animation de calcul — REMPLACE DeckGL (le canvas WebGL ignore z-index) */}
+        {(computing || loading) ? (
+          <div className="absolute inset-0 flex flex-col items-center justify-center bg-background">
             {/* Noeuds pulsants animés */}
             <div className="relative w-56 h-56 mb-2">
-              {/* Anneau tournant */}
+              {/* Anneaux tournants */}
               <div className="absolute inset-0 flex items-center justify-center">
                 <div className="w-32 h-32 rounded-full border-2 border-accent-primary/20 border-t-accent-primary animate-spin" style={{ animationDuration: '1.4s' }} />
               </div>
@@ -457,9 +474,8 @@ export default function ClusteringView() {
               {/* Noeuds orbitaux représentant les clusters */}
               {([0,1,2,3,4,5,6,7] as const).map((i) => {
                 const angle = (i / 8) * 2 * Math.PI;
-                const r = 88;
-                const x = 50 + (r / 1.12) * Math.cos(angle);
-                const y = 50 + (r / 1.12) * Math.sin(angle);
+                const x = 50 + 39 * Math.cos(angle);
+                const y = 50 + 39 * Math.sin(angle);
                 const colors = ['#dc2626','#f97316','#eab308','#22c55e','#3b82f6','#8b5cf6','#ec4899','#14b8a6'];
                 return (
                   <div key={i} className="absolute w-3 h-3 rounded-full animate-ping"
@@ -476,43 +492,44 @@ export default function ClusteringView() {
               </div>
             </div>
             <p className="text-white font-semibold text-lg tracking-wide">Clustering en cours…</p>
-            <p className="text-text-secondary text-sm mt-1">K-means++ · 31 features · toutes les IPs</p>
+            <p className="text-text-secondary text-sm mt-1">
+              K-means++ · 31 features · {Math.round(k * sensitivity)} clusters · toutes les IPs
+            </p>
             <p className="text-text-disabled text-xs mt-2 animate-pulse">Mise à jour automatique toutes les 3 secondes</p>
           </div>
-        )}
-
-        {/* Message état vide */}
-        {!data && !loading && !computing && (
+        ) : !data ? (
+          /* État vide initial */
           <div className="absolute inset-0 flex flex-col items-center justify-center gap-3 text-text-secondary">
             <span className="text-4xl">🔬</span>
             <span>Cliquez sur <strong className="text-white">Recalculer</strong> pour démarrer</span>
           </div>
-        )}
-
-        <DeckGL
-          views={new OrthographicView({ id: 'ortho', controller: true })}
-          viewState={viewState}
-          onViewStateChange={({ viewState: vs }) => setViewState(vs as typeof viewState)}
-          layers={layers as any}
-          style={{ width: '100%', height: '100%' }}
-          controller={true}
-        >
-          {/* Légende overlay */}
-          <div style={{ position: 'absolute', bottom: 16, left: 16, pointerEvents: 'none' }}>
-            <div className="bg-black/70 rounded-lg p-2 text-xs flex flex-col gap-1">
-              {[['#dc2626', 'CRITICAL'], ['#f97316', 'HIGH'], ['#eab308', 'MEDIUM'], ['#22c55e', 'LOW']].map(([c, l]) => (
-                <div key={l} className="flex items-center gap-2">
-                  <span className="w-3 h-3 rounded-full" style={{ background: c }} />
-                  <span className="text-white/80">{l}</span>
-                </div>
-              ))}
+        ) : (
+          /* Canvas WebGL — monté seulement quand il y a des données */
+          <DeckGL
+            views={new OrthographicView({ id: 'ortho', controller: true })}
+            viewState={viewState}
+            onViewStateChange={({ viewState: vs }) => setViewState(vs as typeof viewState)}
+            layers={layers as any}
+            style={{ width: '100%', height: '100%' }}
+            controller={true}
+          >
+            {/* Légende overlay */}
+            <div style={{ position: 'absolute', bottom: 16, left: 16, pointerEvents: 'none' }}>
+              <div className="bg-black/70 rounded-lg p-2 text-xs flex flex-col gap-1">
+                {[['#dc2626', 'CRITICAL'], ['#f97316', 'HIGH'], ['#eab308', 'MEDIUM'], ['#22c55e', 'LOW']].map(([c, l]) => (
+                  <div key={l} className="flex items-center gap-2">
+                    <span className="w-3 h-3 rounded-full" style={{ background: c }} />
+                    <span className="text-white/80">{l}</span>
+                  </div>
+                ))}
+              </div>
             </div>
-          </div>
-          {/* Tooltip zoom hint */}
-          <div style={{ position: 'absolute', bottom: 16, right: selected ? 320 : 16, pointerEvents: 'none' }}>
-            <div className="text-xs text-white/40">Scroll pour zoomer · Drag pour déplacer · Click sur un cluster</div>
-          </div>
-        </DeckGL>
+            {/* Tooltip zoom hint */}
+            <div style={{ position: 'absolute', bottom: 16, right: selected ? 320 : 16, pointerEvents: 'none' }}>
+              <div className="text-xs text-white/40">Scroll pour zoomer · Drag pour déplacer · Click sur un cluster</div>
+            </div>
+          </DeckGL>
+        )}
       </div>
 
       {/* ── Sidebar droite (sélection) ── */}