[Solved]-Call addPoint hang in HighCharts-Highcharts

you don't need to redraw the chart after every add point operation. it is much better to do it after the whole set:

    for (let i = 0; i < 300; i++) {
        chart.series[0].addpoint(data, false);
    }

    chart.redraw();

live demo: http://jsfiddle.net/blacklabel/n0x9sjz7/

api reference: https://api.highcharts.com/class-reference/highcharts.series#addpoint