diff --git a/app/templates/v2/components/queue_widget.html b/app/templates/v2/components/queue_widget.html
index c9197c2..6624d17 100644
--- a/app/templates/v2/components/queue_widget.html
+++ b/app/templates/v2/components/queue_widget.html
@@ -86,8 +86,17 @@
       })
       .catch(function () { /* still */ });
   }
-  // erster Aufruf direkt + danach alle 5 s
+  // Polling: erster Aufruf + alle 5 s. Bei Tab-Wechsel/Hide pausieren,
+  // damit der Browser CPU/Akku spart und keine Listener akkumuliert (#183).
   poll();
-  setInterval(poll, 5000);
+  let _qwInterval = setInterval(poll, 5000);
+  document.addEventListener('visibilitychange', function () {
+    if (document.hidden) {
+      if (_qwInterval) { clearInterval(_qwInterval); _qwInterval = null; }
+    } else if (!_qwInterval) {
+      poll();
+      _qwInterval = setInterval(poll, 5000);
+    }
+  });
 })();
 </script>
diff --git a/app/templates/v2/screens/admin_queue.html b/app/templates/v2/screens/admin_queue.html
index 26ac41a..fe8c2d9 100644
--- a/app/templates/v2/screens/admin_queue.html
+++ b/app/templates/v2/screens/admin_queue.html
@@ -217,6 +217,15 @@ async function refresh() {
 }
 
 refresh();
-setInterval(refresh, 5000);
+let _queueInterval = setInterval(refresh, 5000);
+// Pause-Polling wenn Tab versteckt (#183).
+document.addEventListener('visibilitychange', function () {
+  if (document.hidden) {
+    if (_queueInterval) { clearInterval(_queueInterval); _queueInterval = null; }
+  } else if (!_queueInterval) {
+    refresh();
+    _queueInterval = setInterval(refresh, 5000);
+  }
+});
 </script>
 {% endblock %}
diff --git a/app/templates/v2/screens/admin_stand.html b/app/templates/v2/screens/admin_stand.html
index d9d5346..cfd8a09 100644
--- a/app/templates/v2/screens/admin_stand.html
+++ b/app/templates/v2/screens/admin_stand.html
@@ -282,6 +282,15 @@ async function loadStand() {
 }
 
 loadStand();
-setInterval(loadStand, 30000);
+let _standInterval = setInterval(loadStand, 30000);
+// Pause-Polling wenn Tab versteckt (#183).
+document.addEventListener('visibilitychange', function () {
+  if (document.hidden) {
+    if (_standInterval) { clearInterval(_standInterval); _standInterval = null; }
+  } else if (!_standInterval) {
+    loadStand();
+    _standInterval = setInterval(loadStand, 30000);
+  }
+});
 </script>
 {% endblock %}
diff --git a/app/templates/v2/screens/auswertungen.html b/app/templates/v2/screens/auswertungen.html
index 7680dbc..9eb8a56 100644
--- a/app/templates/v2/screens/auswertungen.html
+++ b/app/templates/v2/screens/auswertungen.html
@@ -665,8 +665,12 @@ async function showZeitreihe(bundesland, partei) {
       '</tbody></table>';
 
     if (window.Chart) {
+      // Modal-Chart-Tracking: vor Re-Render alte Instanz zerstören.
+      if (window._zeitreiheModalChart) {
+        try { window._zeitreiheModalChart.destroy(); } catch (_) {}
+      }
       const ctx = document.getElementById('zeitreihe-chart');
-      new Chart(ctx, {
+      window._zeitreiheModalChart = new Chart(ctx, {
         type: 'line',
         data: {
           labels: z.wahlperioden.map(r => 'WP ' + r.wp),
@@ -700,13 +704,23 @@ async function showZeitreihe(bundesland, partei) {
   }
 }
 
+function _destroyModalChart() {
+  if (window._zeitreiheModalChart) {
+    try { window._zeitreiheModalChart.destroy(); } catch (_) {}
+    window._zeitreiheModalChart = null;
+  }
+}
 function closeModal(ev) {
   if (!ev || ev.target.id === 'modal-backdrop') {
     document.getElementById('modal-backdrop').classList.remove('show');
+    _destroyModalChart();
   }
 }
 document.addEventListener('keydown', (e) => {
-  if (e.key === 'Escape') document.getElementById('modal-backdrop').classList.remove('show');
+  if (e.key === 'Escape') {
+    document.getElementById('modal-backdrop').classList.remove('show');
+    _destroyModalChart();
+  }
 });
 
 // ─── Stimmverhalten × Gemeinwohl ────────────────────────────────────────────
diff --git a/app/templates/v2/screens/cluster.html b/app/templates/v2/screens/cluster.html
index 4694f31..dc82cab 100644
--- a/app/templates/v2/screens/cluster.html
+++ b/app/templates/v2/screens/cluster.html
@@ -267,7 +267,21 @@ function showCluster(idx) {
   renderClusterGraph(cl);
 }
 
+// Aktuelle Force-Simulation — beim Verlassen der Detail-View stoppen,
+// sonst läuft Tick-Listener weiter und akkumuliert Memory (#183).
+let _currentForceSim = null;
+
+function _stopForceSim() {
+  if (_currentForceSim) {
+    try { _currentForceSim.stop(); } catch (_) {}
+    _currentForceSim = null;
+  }
+  const container = document.getElementById('cluster-graph');
+  if (container) container.innerHTML = '';
+}
+
 function renderClusterGraph(cl) {
+  _stopForceSim();
   const container = document.getElementById('cluster-graph');
   if (!container || typeof d3 === 'undefined') return;
   const rawNodes = cl.nodes || [];
@@ -309,7 +323,7 @@ function renderClusterGraph(cl) {
       .attr('width', width).attr('height', height)
       .attr('viewBox', `0 0 ${width} ${height}`);
 
-  const sim = d3.forceSimulation(nodes)
+  const sim = (_currentForceSim = d3.forceSimulation(nodes))
     .force('link', d3.forceLink(links).id(d => d.id)
         .distance(l => (1 - (l.sim || 0)) * 220 + 50)
         .strength(l => l.sim || 0.5))
@@ -358,6 +372,7 @@ function renderClusterGraph(cl) {
 }
 
 function showList() {
+  _stopForceSim();
   document.getElementById('cluster-list').style.display = '';
   document.getElementById('cluster-detail').style.display = 'none';
 }