diff --git a/qml/main.qml b/qml/main.qml
index 70a47744a..244844ceb 100644
--- a/qml/main.qml
+++ b/qml/main.qml
@@ -68,6 +68,17 @@ ApplicationWindow {
         onActivated: Qt.quit()
     }
 
+    ToolTip {
+        id: busyIndicator
+
+        parent: ApplicationWindow.overlay
+
+        visible: spectralController.busy
+        text: "Loading, please wait"
+
+        font.pixelSize: 14
+    }
+
     ToolTip {
         id: errorControl
 
diff --git a/src/controller.h b/src/controller.h
index 600ac140d..a5a4a1012 100644
--- a/src/controller.h
+++ b/src/controller.h
@@ -56,6 +56,9 @@ class Controller : public QObject {
 
   bool busy() { return m_busy; }
   void setBusy(bool busy) {
+    if (m_busy == busy) {
+      return;
+    }
     m_busy = busy;
     emit busyChanged();
   }