wx.onLocationChange获取经纬度为什么很慢，5到6s才成功？

getLocationFun() {

wx.showLoading({

title: '加载中...',

mask: true,

})

let that = this;

// return new Promise((resolve, reject) => {

let _locationChangeFn = (res) => {

console.log('location change', res)

wx.hideLoading()

that.lon = res.longitude;

that.lat = res.latitude;

that.searchClick(); // 刷新列表

wx.offLocationChange(_locationChangeFn)

}

wx.startLocationUpdate({

success: (res) => {

console.log(res);

wx.onLocationChange(_locationChangeFn)

// resolve()

},

fail: (err) => {

console.log('获取当前位置失败', err)

wx.hideLoading()

// reject()

}

})

// })

},

这是监听经纬度代码，获取到经纬度后刷新列表，列表接口本身是很快的，请问有什么优化方案