title: Recorded voice notes slows the application
body: <p>In my iPhone application, i am recording voice of user and saving it in device.
  My setting of AVAudioRecorder is as follows:</p>
  
  <pre><code>NSMutableDictionary* recordSetting = [[NSMutableDictionary alloc] init];
      [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];
      [recordSetting setValue:[NSNumber numberWithFloat:16000.0] forKey:AVSampleRateKey]; 
      [recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
      UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
      AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute,
                              sizeof(audioRouteOverride), &amp;audioRouteOverride);
  </code></pre>
  
  <p>If I save more voices,the application gets slower and slower.I have kept Sample rate low to solve the purpose but even that not woked.What should I do?</p>