diff --git a/bridge/aria_bridge.py b/bridge/aria_bridge.py
index dd3f163..62b17de 100644
--- a/bridge/aria_bridge.py
+++ b/bridge/aria_bridge.py
@@ -38,6 +38,7 @@ import websockets
 from faster_whisper import WhisperModel
 from openwakeword.model import Model as WakeWordModel
 from piper import PiperVoice
+from piper.config import SynthesisConfig
 
 from modes import Mode, detect_mode_switch, should_speak
 
@@ -131,6 +132,7 @@ class VoiceEngine:
         self.voices: dict[str, PiperVoice] = {}
         self.default_voice = "ramona"
         self.highlight_voice = "thorsten"
+        self.speech_speed = 1.0  # 0.5 = langsam, 1.0 = normal, 2.0 = schnell
 
     def initialize(self) -> None:
         """Laedt die Piper-Stimmen aus dem Voices-Verzeichnis."""
@@ -216,8 +218,9 @@ class VoiceEngine:
                     continue
                 with tempfile.NamedTemporaryFile(suffix=".wav", delete=False) as tmp:
                     tmp_path = tmp.name
+                syn_config = SynthesisConfig(length_scale=1.0 / max(0.3, self.speech_speed))
                 with wave.open(tmp_path, "wb") as wav_file:
-                    voice.synthesize_wav(sentence, wav_file)
+                    voice.synthesize_wav(sentence, wav_file, syn_config=syn_config)
                 with wave.open(tmp_path, "rb") as wav_file:
                     if sample_rate is None:
                         sample_rate = wav_file.getframerate()
@@ -494,6 +497,7 @@ class ARIABridge:
                     vc = json.load(f)
                 self.voice_engine.default_voice = vc.get("defaultVoice", "ramona")
                 self.voice_engine.highlight_voice = vc.get("highlightVoice", "thorsten")
+                self.voice_engine.speech_speed = vc.get("speechSpeed", 1.0)
                 self.tts_enabled = vc.get("ttsEnabled", True)
                 logger.info("Voice-Config geladen: %s", vc)
         except Exception as e:
@@ -1024,6 +1028,10 @@ class ARIABridge:
                 self.tts_enabled = bool(payload["ttsEnabled"])
                 logger.info("[rvs] TTS %s", "aktiviert" if self.tts_enabled else "deaktiviert")
                 changed = True
+            if "speechSpeed" in payload:
+                self.voice_engine.speech_speed = max(0.3, min(2.0, float(payload["speechSpeed"])))
+                logger.info("[rvs] Sprechgeschwindigkeit: %.1f", self.voice_engine.speech_speed)
+                changed = True
             # Persistent speichern in Shared Volume
             if changed:
                 try:
@@ -1032,6 +1040,7 @@ class ARIABridge:
                         "defaultVoice": self.voice_engine.default_voice,
                         "highlightVoice": self.voice_engine.highlight_voice,
                         "ttsEnabled": getattr(self, "tts_enabled", True),
+                        "speechSpeed": self.voice_engine.speech_speed,
                     }
                     with open("/shared/config/voice_config.json", "w") as f:
                         json.dump(config_data, f, indent=2)
diff --git a/diagnostic/index.html b/diagnostic/index.html
index 4190b4d..e97a1e0 100644
--- a/diagnostic/index.html
+++ b/diagnostic/index.html
@@ -414,10 +414,21 @@
             <option value="ramona">Ramona (weiblich)</option>
           </select>
         </div>
-        <div style="display:flex;align-items:center;gap:12px;">
+        <div style="display:flex;align-items:center;gap:12px;margin-bottom:12px;">
           <label style="color:#8888AA;font-size:12px;">TTS aktiv:</label>
           <label class="toggle"><input type="checkbox" id="diag-tts-enabled" checked onchange="sendVoiceConfig()"><span class="slider"></span></label>
         </div>
+        <div style="margin-bottom:4px;">
+          <label style="color:#8888AA;font-size:12px;">Sprechgeschwindigkeit: <span id="speed-label">1.0x</span></label>
+        </div>
+        <div style="display:flex;align-items:center;gap:8px;">
+          <span style="color:#555570;font-size:11px;">0.5x</span>
+          <input type="range" id="diag-speech-speed" min="0.5" max="2.0" step="0.1" value="1.0"
+            oninput="document.getElementById('speed-label').textContent=this.value+'x'"
+            onchange="sendVoiceConfig()"
+            style="flex:1;accent-color:#0096FF;">
+          <span style="color:#555570;font-size:11px;">2.0x</span>
+        </div>
       </div>
     </div>
 
@@ -646,6 +657,9 @@
           document.getElementById('diag-default-voice').value = msg.defaultVoice || 'ramona';
           document.getElementById('diag-highlight-voice').value = msg.highlightVoice || 'thorsten';
           document.getElementById('diag-tts-enabled').checked = msg.ttsEnabled !== false;
+          const speed = msg.speechSpeed || 1.0;
+          document.getElementById('diag-speech-speed').value = speed;
+          document.getElementById('speed-label').textContent = speed + 'x';
           return;
         }
 
@@ -1143,7 +1157,8 @@
       const defaultVoice = document.getElementById('diag-default-voice').value;
       const highlightVoice = document.getElementById('diag-highlight-voice').value;
       const ttsEnabled = document.getElementById('diag-tts-enabled').checked;
-      send({ action: 'send_voice_config', defaultVoice, highlightVoice, ttsEnabled });
+      const speechSpeed = parseFloat(document.getElementById('diag-speech-speed').value);
+      send({ action: 'send_voice_config', defaultVoice, highlightVoice, ttsEnabled, speechSpeed });
     }
 
     // ── Highlight-Trigger ────────────────────────
diff --git a/diagnostic/server.js b/diagnostic/server.js
index 8302142..e970f93 100644
--- a/diagnostic/server.js
+++ b/diagnostic/server.js
@@ -1135,6 +1135,7 @@ wss.on("connection", (ws) => {
           defaultVoice: msg.defaultVoice || "ramona",
           highlightVoice: msg.highlightVoice || "thorsten",
           ttsEnabled: msg.ttsEnabled !== false,
+          speechSpeed: msg.speechSpeed || 1.0,
         };
         try {
           fs.mkdirSync("/shared/config", { recursive: true });