多次重复setOption后，lines3D的trail速度会越来越慢echarts lines3D配置项内容和展示

多次重复setOption后，lines3D的trail速度会越来越慢；谷歌、火狐浏览器均有该问题

      var data;

$.getJSON('/asset/get/s/data-1503467127928-B1lYL59uW.json', function(predata) {
    data = predata;

});

function draw() {
    var airports = data.airports.map(function(item) {
        return {
            coord: [item[3], item[4]]
        }
    });

    function getAirportCoord(idx) {
        return [data.airports[idx][3], data.airports[idx][4]];
    }

    // Route: [airlineIndex, sourceAirportIndex, destinationAirportIndex]
    var routesGroupByAirline = {};
    data.routes.forEach(function(route) {
        var airline = data.airlines[route[0]];
        var airlineName = airline[0];
        if (!routesGroupByAirline[airlineName]) {
            routesGroupByAirline[airlineName] = [];
        }
        routesGroupByAirline[airlineName].push(route);
    });

    var pointsData = [];
    data.routes.forEach(function(airline) {
        pointsData.push(getAirportCoord(airline[1]));
        pointsData.push(getAirportCoord(airline[2]));
    });

    var series = data.airlines.map(function(airline) {
        var airlineName = airline[0];
        var routes = routesGroupByAirline[airlineName];

        if (!routes) {
            return null;
        }
        return {
            type: 'lines3D',
            name: airlineName,

            effect: {
                show: true,
                trailWidth: 4,
                trailLength: 1,
                trailOpacity: 1,
                trailColor: 'rgb(30, 30, 60)'
            },

            lineStyle: {
                width: 2,
                color: 'rgb(50, 50, 150)',
                // color: 'rgb(118, 233, 241)',
                opacity: 0.2
            },
            blendMode: 'lighter',

            data: routes.map(function(item) {
                return [airports[item[1]].coord, airports[item[2]].coord];
            })
        };
    }).filter(function(series) {
        return !!series;
    });
    series.push({
        type: 'scatter3D',
        coordinateSystem: 'globe',
        blendMode: 'lighter',
        symbolSize: 2,
        itemStyle: {
            color: 'rgb(50, 50, 150)',
            opacity: 0.2
        },
        data: pointsData
    });

    myChart.setOption({
        legend: {
            selectedMode: 'single',
            left: 'left',
            data: Object.keys(routesGroupByAirline),
            orient: 'vertical',
            textStyle: {
                color: '#fff'
            }
        },
        globe: {
            
            baseTexture: '/asset/get/s/data-1503467266702-Skjbw59ub.jpg',
            environment: '/asset/get/s/data-1503467955610-Skh2tc9_b.jpg',
            heightTexture: '/asset/get/s/data-1503467275962-SJNfv9q_b.jpg',

            displacementScale: 0.1,
            displacementQuality: 'high',

            shading: 'realistic',
            realisticMaterial: {
                roughness: 0.9,
                metalness: 0
            },

            postEffect: {
                enable: true
            },
            temporalSuperSampling: {
                enable: true
            },
            light: {
                ambient: {
                    intensity: 1
                },
                main: {
                    intensity: 1,
                    shadow: false
                },
                ambientCubemap: {
                    texture: '/asset/get/s/data-1503467280745-SkKzPc9O-.hdr',
                    exposure: 0,
                    diffuseIntensity: 0.5,
                    specularIntensity: 0
                }
            },
            viewControl: {
                autoRotate: false
            },
            silent: false
        },
        series: series
    });
}
window.setInterval(draw, 5000);