Bonnie,

Thank you. Here is minimal testcase to reproduce the 8 sec delay:

using System;
using System.Windows.Forms;

class Test
{
    public static void Main()
    {
        Application.Run(new VirtualModeForm());
    }
}

class VirtualModeForm : Form
{
    DataGridView grid = new DataGridView();
    public VirtualModeForm()
    {
        Controls.Add(grid);
        grid.VirtualMode = true;
        grid.ColumnCount = 108;
        // this line causes 8 seconds delay.
        grid.RowCount = 1000000;
    }
}

MSDN has DataGridView_Samples.zip which contains two VirtualMode grid samples and a doc file covering VirtualMode a bit.
Part of samples from this file are also duplicated in MSDN doc code samples.
MSDN forums contains also some few messages about VirtualMode.
There is also a Chris Cells book.
My code is based on this information.

I have looked first 100 pages returned from google search.
I havent found any other information about DataGridView VirtualMode.

Any idea how to create fast editable virtual grid ?
Maybe some other control can be used ?
I looked to http://www.devage.com/ SourceGrid but last version was released a year ago so it seems not developed.

Andrus.