How to optimize pixel scrolling in the WinForms GridControl?

public class DerivedGridControl : GridControl
{
// Gets the Scroll Position for the pixel scrolling of a row.
public override int RowIndexToVScrollPixelPos(int rowIndex)
{
    // Takes separate height for the column headers into account.
    rowIndex = Math.Min(rowIndex, Model.RowCount);
    if (rowIndex > 0)
        return (rowIndex - 1) * Model.Rows.DefaultSize +
        Model.RowHeights[0];
    else
        return Model.RowHeights[0];
}
// Gets the value for the vertical pixel Position.
public override int GetVScrollPixelHeight()
{
    //Checks the number of rows in the Grid.
    if (Model.RowCount == 0)
        return 0;
    // Returns the vertical pixel position.
    return (Model.RowCount - 1) * Model.Rows.DefaultSize +
    Model.RowHeights[0];
}
// Gets the row and pixel Delta to the scroll position of the row for the specified scroll position.
public override void VScrollPixelPosToRowIndex(int pixelPos, out
int rowIndex, out int pixelDelta)
{
    if (pixelPos < pixelPos - Model.RowHeights[0])
    {
        rowIndex = 0;
        pixelDelta = pixelPos;
    }
    rowIndex = (pixelPos - Model.RowHeights[0]) /
    Model.Rows.DefaultSize + 1;
    pixelDelta = (pixelPos - Model.RowHeights[0]) %
    Model.Rows.DefaultSize;
}

Public Class DerivedGridControl
 Inherits GridControl
'Gets the Scroll Position for the pixel scrolling of a row.
Public Overrides Function RowIndexToVScrollPixelPos(ByVal rowIndex As Integer) As Integer
 'Takes separate height for the column headers into account.
 rowIndex = Math.Min(rowIndex, Model.RowCount)
 If rowIndex > 0 Then
  Return (rowIndex - 1) * Model.Rows.DefaultSize + Model.RowHeights(0)
 Else
  Return Model.RowHeights(0)
 End If
End Function
'Gets the value for the vertical pixel position.
Public Overrides Function GetVScrollPixelHeight() As Integer
 'Checks the number of rows in the Grid.
 If Model.RowCount = 0 Then
  Return 0
 End If
 'Returns the vertical pixel Position.
 Return (Model.RowCount - 1) * Model.Rows.DefaultSize + Model.RowHeights(0)
End Function
'Gets the row and pixel Delta to the scroll position of the row for the specified scroll position.
Public Overrides Sub VScrollPixelPosToRowIndex(ByVal pixelPos As Integer, <System.Runtime.InteropServices.Out()> ByRef rowIndex As Integer, <System.Runtime.InteropServices.Out()> ByRef pixelDelta As Integer)
 If pixelPos < pixelPos - Model.RowHeights(0) Then
  rowIndex = 0
  pixelDelta = pixelPos
 End If
 rowIndex = (pixelPos - Model.RowHeights(0)) / Model.Rows.DefaultSize + 1
 pixelDelta = (pixelPos - Model.RowHeights(0)) Mod Model.Rows.DefaultSize
End Sub

this.gridControl1 = new VscrollOptimization.DerivedGridControl();

Me.gridControl1 = New VscrollOptimization.DerivedGridControl()

//Sets VScrollPixce value to true to enable pixel scrolling.
this.gridControl1.VScrollPixel = true;

'Sets VScrollPixce value to true to enable pixel scrolling.
Me.gridControl1.VScrollPixel = True