Index: addons/symbolviewer/plugin_katesymbolviewer.h
===================================================================
--- addons/symbolviewer/plugin_katesymbolviewer.h
+++ addons/symbolviewer/plugin_katesymbolviewer.h
@@ -128,6 +128,7 @@
 
     QTimer m_updateTimer;
     QTimer m_currItemTimer;
+    int    m_oldCursorLine;
 
     void updatePixmapScroll();
 
Index: addons/symbolviewer/plugin_katesymbolviewer.cpp
===================================================================
--- addons/symbolviewer/plugin_katesymbolviewer.cpp
+++ addons/symbolviewer/plugin_katesymbolviewer.cpp
@@ -177,9 +177,6 @@
 
 void KatePluginSymbolViewerView::slotRefreshSymbol()
 {
-  if (!m_symbols)
-    return;
-
   parseSymbols();
 }
 
@@ -199,7 +196,7 @@
 
 void KatePluginSymbolViewerView::slotDocChanged()
 {
- slotRefreshSymbol();
+ slotDocEdited();
 
  KTextEditor::View *view = m_mainWindow->activeView();
  //qDebug()<<"Document changed !!!!" << view;
@@ -214,6 +211,7 @@
 
 void KatePluginSymbolViewerView::slotDocEdited()
 {
+  m_currItemTimer.stop(); // Avoid unneeded update
   m_updateTimer.start(500);
 }
 
@@ -235,7 +233,13 @@
   if (!doc) {
     return;
   }
+
   int currLine = editView->cursorPositionVirtual().line();
+  if (currLine == m_oldCursorLine) {
+    // Nothing to do
+    return;
+  }
+  m_oldCursorLine = currLine;
 
   int newItemLine = 0;
   QTreeWidgetItem *newItem = nullptr;
@@ -291,6 +295,9 @@
 
 void KatePluginSymbolViewerView::parseSymbols(void)
 {
+  if (!m_symbols)
+    return;
+
   m_symbols->clear();
   // Qt docu recommends to populate view with disabled sorting
   // https://doc.qt.io/qt-5/qtreeview.html#sortingEnabled-prop
@@ -335,6 +342,7 @@
   else
     new QTreeWidgetItem(m_symbols,  QStringList(i18n("Sorry. Language not supported yet") ) );
 
+  m_oldCursorLine = -1;
   updateCurrTreeItem();
   if (m_sort->isChecked())
     m_symbols->sortItems(0, Qt::AscendingOrder);