sxmpasch commented on issue #9258: timeline在ie下性能问题 URL: https://github.com/apache/incubator-echarts/issues/9258#issuecomment-433738959 @Ajaxluo - thank you for the example. If you add / remove elements, it takes time to recalculate the average value. Since you do not have zoom enabled, perhaps a data reduction during init could be everything you need: 谢谢你的例子。如果添加/删除元素，则需要时间重新计算平均值。由于您没有启用缩放，因此初始化期间的数据缩减可能是您需要的一切: ``` var it=0; var numItems=80000; // number of data elements var numAvg=20; // number of data items to reduce to one average element for (var i = 0; i < numItems; i++) { data.push(randomData()); } var dredIdx=0; var d=0, dsum=0; for (var i=0; i<numItems; i++) { dsum+=data[i].value[1]; if ((i% numAvg)===0) { d=data[i]; d.value[1]=dsum/numAvg; dsum=0; dred.push(d); } } ... setInterval(function () { for (var i = 0; i < 5; i++) { dred.shift(); dred.push(randomData()); } var s = 'test #'+it; it++; myChart.setOption({ title: {text:s }, series: [{ data: dred }] }); }, 2000); ```
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