Improve highcharts performance for large amounts of data

Question

I am trying to get a larger amount of data. Sample data is below

1850/01   -0.845   -0.922   -0.748   -1.038   -0.652   -1.379   -0.311   -1.053   -0.636   -1.41         


        

Answer 1

new Array(length)

Specify the array's length rather than creating an empty array. Writing to an existing offset in an array is substantially faster than creating a new offset each time you write an item.

var data = new Array(lines.length);  // Specify array length

$.each(lines, function(index, row) {
  var cells = row.split(','),
  series = {
    type: 'line',
    data: new Array(cells.length)  // Specify array length
  };

  $.each(cells, function(itemNo, item) {
    if (itemNo == 0) {
      series.name = item;
    } else {
      series.data.push(parseFloat(item));
    }
  });

  data.push(series);
});