diff --git a/src/Application/FormMain.cs b/src/Application/FormMain.cs
index 3dfc4fab..bc696270 100644
--- a/src/Application/FormMain.cs
+++ b/src/Application/FormMain.cs
@@ -169,6 +169,7 @@ public FormMain(SettingsLocation location)
             this.ContextMenuStrip = this.contextMenu1;
             New();
 
+            this.xsltViewer.Visible = false;
             if (!testing)
             {
                 _ = AsyncSetup();
@@ -736,11 +737,13 @@ protected virtual void TabControlViews_Selected(object sender, NoBorderTabContro
             {
                 this.helpProvider1.HelpNamespace = this._helpService.XsltHelp;
                 this.CheckWebViewVersion();
+                this.xsltViewer.Visible = true;
                 this.DisplayXsltResults();
             }
             else
             {
                 this.helpProvider1.HelpNamespace = this._helpService.DefaultHelp;
+                this.xsltViewer.Visible = false;
                 this.xsltViewer.OnClosed(); // good time to cleanup temp files.
             }
         }
diff --git a/src/XmlNotepad/NodeTextView.cs b/src/XmlNotepad/NodeTextView.cs
index 4b4a1f63..26752763 100644
--- a/src/XmlNotepad/NodeTextView.cs
+++ b/src/XmlNotepad/NodeTextView.cs
@@ -1127,6 +1127,7 @@ class AccessibleNodeTextViewNode : AccessibleObject
         private TreeNode _node;
         private NodeTextView _view;
         private AccessibleNodeTextView _acc;
+        private int _childCount = -1;
 
         public AccessibleNodeTextViewNode(AccessibleNodeTextView acc, TreeNode node)
         {
@@ -1159,11 +1160,17 @@ public override string Description
         }
         public override void DoDefaultAction()
         {
+            _childCount = -1;
             _node.Toggle();
         }
         public override int GetChildCount()
         {
-            return _node.Children.Count;
+            if (_childCount == -1)
+            {
+                // This can be VERY slow as it populates the children right here!
+                _childCount = _node.Children.Count;
+            }
+            return _childCount;
         }
         public override AccessibleObject GetChild(int index)
         {
diff --git a/src/XmlNotepad/TreeView.cs b/src/XmlNotepad/TreeView.cs
index 93f490cc..722b1f47 100644
--- a/src/XmlNotepad/TreeView.cs
+++ b/src/XmlNotepad/TreeView.cs
@@ -1685,9 +1685,10 @@ internal void DrawLabel2(Graphics g, Font f)
 
         internal static TreeNodeCollection GetChildren(TreeNode n)
         {
-            if (n.Children.Count > 0)
+            var children = n.Children;
+            if (children.Count > 0)
             {
-                return n.Children;
+                return children;
             }
             return null;
         }
diff --git a/src/XmlNotepad/XmlTreeView.cs b/src/XmlNotepad/XmlTreeView.cs
index 1b3465dd..ff2bdf51 100644
--- a/src/XmlNotepad/XmlTreeView.cs
+++ b/src/XmlNotepad/XmlTreeView.cs
@@ -1810,6 +1810,7 @@ public class XmlTreeNode : TreeNode, IXmlTreeNode
         private string _editLabel;
         private string _schemaAwareText;
         private Color _schemaAwareColor;
+        private TreeNodeCollection _lazyChildren;
 
         public XmlTreeNode(XmlTreeView view)
         {
@@ -2062,7 +2063,11 @@ public override TreeNodeCollection Children
         {
             get
             {
-                return new XmlTreeNodeCollection(this);
+                if (this._lazyChildren  == null)
+                {
+                    this._lazyChildren = new XmlTreeNodeCollection(this);
+                }
+                return _lazyChildren;
             }
         }
 
diff --git a/src/XmlNotepad/XsltViewer.cs b/src/XmlNotepad/XsltViewer.cs
index 1f2eb3b5..5f422875 100644
--- a/src/XmlNotepad/XsltViewer.cs
+++ b/src/XmlNotepad/XsltViewer.cs
@@ -213,7 +213,7 @@ void OnModelChanged(ModelChangedEventArgs e)
                 {
                     this.SourceFileName.Text = _model.XsltFileName;
                 }
-                if (e.ModelChangeType == ModelChangeType.Reloaded)
+                if (e.ModelChangeType == ModelChangeType.Reloaded && this.Visible)
                 {
                     this.delayedActions.StartDelayedAction("UpdateXslt", DisplayXsltResults, TimeSpan.FromSeconds(0.5));
                 }