diff --git a/protege-editor-core/src/main/java/org/protege/editor/core/ui/list/MList.java b/protege-editor-core/src/main/java/org/protege/editor/core/ui/list/MList.java
index dbf47529d..697ba051e 100644
--- a/protege-editor-core/src/main/java/org/protege/editor/core/ui/list/MList.java
+++ b/protege-editor-core/src/main/java/org/protege/editor/core/ui/list/MList.java
@@ -68,7 +68,6 @@ public String getName() {
 
     private MListCellRenderer ren;
 
-
     private boolean mouseDown;
 
     private List<MListButton> editAndDeleteButtonList = Arrays.asList(editButton, deleteButton);
@@ -77,6 +76,8 @@ public String getName() {
 
     private List<MListButton> deleteButtonList = Arrays.asList(deleteButton);
 
+    private Point lastMousePosition;
+    
     public int lastMousePositionCellIndex = -1;
 
     
@@ -154,9 +155,9 @@ private void handleMouseMoved() {
         	    if (dirty != null) {        	    	  
         	    	   repaint(dirty);
         	    }
-            Point pt = MList.this.getMousePosition();            
-            if (pt != null) {
-                lastMousePositionCellIndex = MList.this.locationToIndex(pt);
+        	lastMousePosition = super.getMousePosition();            
+            if (lastMousePosition != null) {
+                lastMousePositionCellIndex = MList.this.locationToIndex(lastMousePosition);
             }
             else {
                 lastMousePositionCellIndex = -1;
@@ -168,6 +169,12 @@ private void handleMouseMoved() {
         }
     }
 
+    @Override
+	public Point getMousePosition() {
+    	// use the cache mouse position to avoid performance problems, see #723
+		return lastMousePosition;    	
+    }
+    
     protected String getRowName(Object rowObject) {
         return null;
     }
diff --git a/protege-editor-owl/src/main/java/org/protege/editor/owl/ui/renderer/OWLCellRenderer.java b/protege-editor-owl/src/main/java/org/protege/editor/owl/ui/renderer/OWLCellRenderer.java
index c46043f0c..a51f647b1 100644
--- a/protege-editor-owl/src/main/java/org/protege/editor/owl/ui/renderer/OWLCellRenderer.java
+++ b/protege-editor-owl/src/main/java/org/protege/editor/owl/ui/renderer/OWLCellRenderer.java
@@ -490,7 +490,7 @@ private void setupLinkedObjectComponent(JComponent component, Rectangle cellRect
         }
         if (component instanceof LinkedObjectComponent && OWLRendererPreferences.getInstance().isRenderHyperlinks()) {
             linkedObjectComponent = (LinkedObjectComponent) component;
-            Point mouseLoc = component.getMousePosition(true);
+            Point mouseLoc = component.getMousePosition();
             if (mouseLoc == null) {
                 linkedObjectComponent.setLinkedObject(null);
                 return;