javascript – 如何提高highcharts图表创建和渲染的性能

我在本地有一个具有 JSON格式数据的文件.我创建了很少的 PHP脚本,以便在通过AJAX调用时回显此文件的输出.数据文件的大小为59k.我按照highcharts建议禁用动画和阴影.当我加载图表时,渲染需要非常长的时间.我已粘贴下面的脚本.我能做些什么来更快地渲染这个图表？就目前而言,这绝对是不可接受的.

echo_file.PHP输出如下所示：

[{"name":"loess","data":[[1373241600000,3.49571041760408],[1373241660000,3.4844505982485],[1373241720000,3.47324293684199],[1373241780000,3.46208745646435],[1373241840000,3.45098418019539],[1373241900000,3.43993313111491],[1373241960000,3.42893433230273],[1373242020000,3.41798780683864],[1373242080000,3.4070935778
43611722495],[1373243400000,3.18069824879358],[1373243460000,3.17101320762565],[1373243520000,3.16138101680096],[1373243580000,3.15180169939934],[1373243640000,3.14227527850057],[1373243700000,3.13280177718446],[1373243760000,3.12338121853083],[1373243820000,3.11401362561948],[1373243880000,3.10469902153021]]}]

这是脚本：

$(document).ready(function() {


 var seriesOptions = [],yAxisOptions = [],colors = Highcharts.getoptions().colors;

function myAjax() {
    $.ajax({
                url: 'echo_file.PHP',datatype: 'json',success: function(data) {

                    seriesOptions=data;
                    createChart();
                },cache: false    
                });
}

setInterval(myAjax,300000); 


   function createChart() {

        $('#container').highcharts('StockChart',{
            chart: {
                animation: false,shadow: false

            },title : {
            text : 'cpu utilization'
        },plotOptions: {

            series: {
                linewidth: 2
            }
        },rangeSelector: {
                enabled: true,buttons: [{
                        type: 'minute',count: 60,text: 'hourly'
                    },{
                        type: 'all',text: 'All'
                    }]
            },credits: {
                enabled: false
            },xAxis: {
                type: 'datetime',minPadding:0.02,maxPadding:0.02,ordinal: false



            },yAxis: {
                labels: {
                    formatter: function() {
                        //return (this.value > 0 ? '+' : '') + this.value + '%';
                        return (this.value);
                    }
                }

            },yAxis : {
                title : {
                    text : '% cpu utilization'
                },min:0,max:100,plotLines : {
                    value : 70,color : '#FFA500',dashStyle : 'shortdash',width : 2,label : {
                        text : 'Threshold',align:'right'
                    }
                }                           

            },scrollbar: {
                    enabled: true
                    },navigator : {
                adaptToUpdatedData: false

            },tooltip: {
                pointFormat: '<span style="color:{series.color}">{series.name}</span>: <b>{point.y} </b>',valueDecimals: 2
            },series: seriesOptions

        });
    }

});