微信小程序做实时记录运动轨迹，运动路程较长大于5公里或10公里，polyline中数组非常大，导致后续绘制轨迹超级卡顿，闪烁怎么解决

在markers中添加了iconPath路径，从APPDATA界面中看出赋值成功，但是页面渲染失败，iconpath路径正确无误 [图片][图片] 页面上没有图标，预期效果应该是又绿点的 [图片] [图片]

<scroll-view class='scrollCar' scroll-y style="height:100vh"  bindscrolltolower="handleScrollBottom" scroll-into-view="{{toCity}}">     <block wx:for="{{carList}}" wx:key="index" wx:if="{{carList.length}}">         <view class="f-border-b" data-stocknum='{{item.stockNum}}' bindtap='changeCar'>             <my-car-item car-info="{{item}}"></my-car-item>         </view>         </block>         <view class="m-empty" wx:if="{{carList.length == 0}}">             <view class="n-c-p">                 <view class="n-c-img">                     <image class='allCarImg' src='../../Resources/no-car.png'></image>                 </view>                 <view>此城市没有此条件的车辆</view>             </view>         </view>         <view class="z-loading f-text-center f-wing-space" wx:if="{{isBottom}}">已到底线</view>         <view wx:else class="z-loading f-text-center f-wing-space">加载中...</view>     </block> </scroll-view>