javascript - Highcharts JS getting very slow when updating with many data points -

i have static local webpage supposed updated data csv file (so data written file, page should update , display new data). issue many data pointys, becomes slow , after number of points not update @ all.

currently, way page updates reads file every 3 seconds , updates accordingly. imagine more efficient way see recent additions file , append new points current data set. i'm not sure how that.

code below parses csv file , separates data arrays used in charts:

function  parsecsvdata(csvfile) {      time = [];     altitude = [];     outsidetemp = [];     insidetemp = [];     voltage = [];     state = [];     velocity = [];     degrees = [];     // cut csv datafiles lines     var lines = csvfile.split("\n");      $.each(lines, function (linenumber, line) {          if (linenumber != 0) {   // skip header line             var fields = line.split(",");               var missiontime = parseint(fields[1]);             var altitude2 = parseint(fields[2]);             var outsidetemp2 = parseint(fields[3]);             var insidetemp2 = parseint(fields[4]);             var voltage2 = parseint(fields[5]);             var state2 = parseint(fields[6]);             var velocity2 = parseint(fields[7]);             var degrees2 = parseint(fields[8]);              time.push(missiontime);             altitude.push(altitude2);             outsidetemp.push(outsidetemp2);             insidetemp.push(insidetemp2);             voltage.push(voltage2);             state.push(state2);             velocity.push(velocity2);             degrees.push(degrees2);          }     }); } 

this code update charts every 3 seconds:

setinterval(function blah() {      var file = filename+'?q='+math.random();     fillcharts(file);//which calls parsecsvdata function , fills charts }, 3000); 

edit: pastebin entire code: http://pastebin.com/qmzn8azy

edit2: sample csv data:

team_id,mission_time,alt_sensor,outside_temp,inside_temp,voltage,fsw_state,velocity,degrees ubartemis,0,36,20,20,9,1,0,0 ubartemis,1,45,18,20,9,1,6,2 ubartemis,2,200,16,20,9,1,10,5 ubartemis,3,65,14,19,9,1,15,3 ubartemis,4,79,12,17,8,2,22,4 ubartemis,5,100,10,16,8,3,30,2 ubartemis,6,120,8,15,8,4,39,0