title: Highcharts, minimum, maximum with additional label
body: <p>I have time line chart with about 2000 point, the data are loaded from csv file.
  I would like to add labels for minimum, maximum and last point.</p>
  
  <p>When I do this in this way than it take too much time to genereate it.
  How can I do this in faster way ?</p>
  
  <pre><code>var chart = new Highcharts.Chart(options);
  chart.series[0].data[chartMinNo].update({ 
    marker: {
      radius: 2,
      lineColor: '#CC2929',
      lineWidth: 2,
      fillColor: '#CC2929',
      enabled: true
    },
    dataLabels: {
      enabled: true,
      borderRadius: 3,
      borderColor: '#CC2929',
      borderWidth: 1,
      y: -23,
      formatter: function() {
        return "Min : " + chartMinValue;
        }
      }
  });
  </code></pre>