new mars3d.graphic.FixedRoute({的position长度超过一百条浏览器会卡死的解决方案

问题场景描述：

FixedRoute的position数据已经很精细时，会导致卡死的问题

解决方案：

数据已经很精细时，可以不用autoSurfaceHeight来计算，如果非要用，可以加个minDistance: 200参数。

  fixedRoute.autoSurfaceHeight({ minDistance: 200 }).then(function (e) {startFly(fixedRoute)})

相关链接：

http://mars3d.cn/editor-vue.html?key=ex_7_5_5&id=graphic/custom/fixedRoute-ground

问题position:

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