如何让地图的某块亮起了但不重绘地图

Question

需求是实现了，但是一直重绘太卡了 影响体验.
//配置

  polar: {
    tooltip: {
      show: true,
      backgroundColor: "rgba(255,255,255,.8)",
      textStyle: {
        color: "#5a5c5e",
        fontSize: 12
      },
      padding: 0,
      borderWidth: 1,
      borderColor: "rgb(218,219,220)",
      extraCssText: "box-shadow: 0 0 3px rgba(0, 0, 0, 0.2);",
      formatter: params => {
        let str = "";
        let name = params.name || "未知";
        let value = params.value || 0;
        let than = value
          ? ((value / this.regionTotal[this.selectedName]) * 100).toFixed(2)
          : 0;
        str += `<div style="line-height:20px;"><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:#3398DB;"></span>浏览量(PV)<span style="float: right;">${value}</span><div/>`;
        str += `<div style="line-height:20px;"><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:#6EC71F;"></span>浏览量(PV)<span style="float: right;">${than}%</span><div/>`;
        return `<div style="padding-left:12px;background:rgb(244,246,246);width:180px;line-height:30px;border-bottom:1px solid #e1e1e1;">${name}</div><div style="padding:8px 12px;">${str}</div>`;
      }
    },
    graphic: [
      {
        type: "image",
        id: "logo",
        left: 20,
        bottom: 10,
        z: -10,
        bounding: "raw",
        style: {
          image:
            "https://tongji.baidu.com/web/css/decorator/map-legend.png",
          width: 100,
          height: 20
        }
      }
    ],
    visualMap: {
      show: false,
      max: 7,
      inRange: {
        color: ["#edfbfb", "#b7d6f3", "#40a9ed", "#3598c1", "#215096"]
      }
    },
    grid: {
      right: "0%",
      top: "0%",
      bottom: "0%",
      left: "0%"
    },
    geo: {
      roam: false,
      map: "china",
      top: 0,
      left: "right",
      bottom: 20,
      label: {
        emphasis: {
          show: false
        }
      },
      itemStyle: {
        emphasis: {
          areaColor: "#fff464"
        }
      },
      regions: [
        {
          name: "南海诸岛",
          value: 0,
          itemStyle: {
            normal: {
              opacity: 0,
              label: {
                show: false
              }
            }
          }
        }
      ]
    },
    series: [
      {
        name: "mapSer",
        type: "map",
        geoIndex: 0,
        emphasis: {
          label: false
        }
      }
    ]
  }
  
  
  
      showTips(item, index) {
  if (item.name === "其他") {
    this.outHandle();
  } else {
    this.polar.geo.regions = [
      {
        name: item.name,
        selected: true
      },
      {
        name: "南海诸岛",
        itemStyle: {
          opacity: 0
        }
      }
    ];
    this.$refs.vEcharts.dispatchAction({
      type: "showTip",
      seriesIndex: 0,
      name: item.name
    });
  }
}

//重绘函数
   showTips(item, index) {
  if (item.name === "其他") {
    this.outHandle();
  } else {
    this.polar.geo.regions = [
      {
        name: item.name,
        selected: true
      },
      {
        name: "南海诸岛",
        itemStyle: {
          opacity: 0
        }
      }
    ];
    this.$refs.vEcharts.dispatchAction({
      type: "showTip",
      seriesIndex: 0,
      name: item.name
    });
  }
},