A question about the efficiency of GDI+.

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C#

VB

.NET

GDI+

I met a question about the efficiency of GDI+.
There are several variables and methods
 as below:
1.points, such as A(Represents a coordinate point, such as X Y Z), B, C, D, E, etc.

2 List named Cmd1, used to add points by thread

3.paint method, in this method, the set of points connected to the line

4.thread for the constant addition of new points,such as F,G,H,I,J etc.

In Paint Method,i use g.DrawLine() to link a and b,c,d,e.
In thread,when i add new points,i will call invalid to refresh component.
so my question is,points become more and more, how can I maintain high efficiency, and redraw, 

do not start from the a point to re - drawline.

What I have tried:

Sub DrawGLines2(g As Graphics)

        g.SmoothingMode = SmoothingMode.HighSpeed
        Dim Pen As New Pen(Brushes.White)
        Dim i As Int32
        'Dim c As Int32
        Dim preCmd1 As Cmd1
        Try
            For Each cmd As Cmd1 In Cmd1s            
                    Dim pfs() As PointF = cmd.PointFs.ToArray
                    If preCmd1 IsNot Nothing Then
                        g.DrawLine(Pen, cmd.PointFs(0), preCmd1.PointFs(0))
                    End If
                    preCmd1 = cmd
                End If
              
            Next
        Catch ex As Exception
            Debug.Print(ex.Message)
        End Try
    End Sub
------------------------------------------------------------
  Private Sub Sheet_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
      If Me.Cmd1s.Count>0 Then
            DrawGLines2(e.Graphics) 
        End If
    End Sub
-------------------------------------------------------------------------
    Public Sub AddPoint(x As Double, y As Double, z As Double, Optional G As Int32 = -1)
        Dim cmd1 As DrvSimu.Cmd1 = Nothing
        If cmd1 Is Nothing Then
            cmd1 = New DrvSimu.Cmd1
            Me.Cmd1s.Add(cmd1)
        End If

        Dim pf3d As New PointF3D(x, y, z)
        cmd1.PointF3Ds.Add(pf3d)

        Me.Invalidate()

    End Sub

thread will call AddPoint to add a,b,c,d,e points，and use invalid method to refresh,when i call invalid,the "For Each cmd As Cmd1 In Cmd1s" for each will begin from A point,so when points become more and more, how can I maintain high efficiency, and redraw, do not start from A point to re - drawline