it's possible this is just typical performance for the chart, but a minute for 150 points seems a bit slow to me.  here are my benchmarks using a 2.13GHz Core2 with 3.25GB of RAM

scatter chart with 15000 points: 4.02 seconds

scatter chart with 1500 points:  2.36 seconds

scatter chart with 150 points: 0.47 seconds 

here is the code i'm using 

private void Form1_Load(object sender, EventArgs e)
{
    XYSeries xy = new XYSeries();
    for (int current = 0; current < 150; current++)
    {
        xy.Points.Add(new XYDataPoint((double)current, (double)current, current.ToString(), false));
    }
    this.ultraChart1.ChartType = Infragistics.UltraChart.Shared.Styles.ChartType.ScatterChart;
    this.ultraChart1.Series.Add(xy);
}

private void button1_Click(object sender, EventArgs e)
{
    DateTime start = DateTime.Now;
   
    //Create a new report
    Infragistics.Documents.Report.Report r =
      new Infragistics.Documents.Report.Report();

    Graphics g = r.AddSection().AddCanvas().CreateGraphics();
    ultraChart1.RenderPdfFriendlyGraphics(g);

    //Define a string that contains the path to
    // the current user's My Documents folder.

    string myDocuments =
      System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments);

    // Publish the report to the current user's
    // My Documents folder with the name of Report.pdf.
    r.Publish(myDocuments + "\\Report.pdf", FileFormat.PDF);
    Console.WriteLine(DateTime.Now.Subtract(start).ToString());

}