Rather than load all my data into the treeview I am loading when a
level-1node gets expanded (for the first time).
To set up the code below, I've added a single child node for each
level-1node, just so that I can get the "+" and the capability to
expand.

So the first time I click on any level-1 node, it loads 30 child nodes.

The problem is how slow this is.  To me it should be almost
instantaneous.  It takes 2-3 seconds, which doesn't sound like much,
but believe me, it's irritating.  The scroll bar rolls down the screen.
Once the nodes are populated, expanding and collapsing the parent node
is suitably quick.

Any ideas on at least making this appear quicker?

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Private Sub myTreeView_AfterExpand(ByVal sender As Object, ByVal e As
System.Windows.Forms.TreeViewEventArgs) Handles myTreeView.AfterExpand

       Dim classNode As TreeNode
       Dim testCtr As Integer

       If e.Node.Nodes.Count = 1 Then
           If e.Node.Text = e.Node.Nodes(0).Text Then
               e.Node.Nodes.Clear()
               For testCtr = 1 To 50
                   classNode = e.Node.Nodes.Add(testCtr.ToString)
               Next

           End If
       End If
   End Sub