very lag and not smooth when drag and zoom the lineChartView

very lag and not smooth when drag and zoom the lineChartView，the same is true for the first load, and when i drag to some scale(like the last pic), It's become to normal with temporary。
**there are my code**

`
private func fetchEventChartInfo() {
guard let id = self.event?.eventId else {return}
showProgressHUD()
RainHttpManager.request(ApiTrip.fetchTripEventChartInfo(eventId: id), success: { (response) in
let details = response?["details"].arrayValue
self.configureChartView(details: details)
}) { (errCode, errMsg, response) in
self.showErrorHUD(errMsg)
}
}

private func initChartView() {
chartView.chartDescription?.enabled = false
chartView.dragEnabled = true
chartView.pinchZoomEnabled = true
chartView.scaleYEnabled = false

chartView.xAxis.gridColor = UIColor.white
chartView.leftAxis.gridLineDashLengths = [4, 4]
chartView.leftAxis.gridColor = UIColor.color(withHex: "909090")
chartView.rightAxis.enabled = false
chartView.xAxis.labelPosition = .bottom
chartView.xAxis.axisLineColor = UIColor.color(withHex: "BBBBBB")
chartView.leftAxis.axisLineColor = UIColor.color(withHex: "BBBBBB")
chartView.xAxis.labelCount = 10

chartView.xAxis.valueFormatter = SecondAxisValueFormatter()

let marker = BalloonMarker(color: UIColor(white: 180/255, alpha: 0.5),
font: .systemFont(ofSize: 12),
textColor: TripBehavior(rawValue: event!.type)?.chartColor() ?? UIColor.red,
insets: UIEdgeInsets(top: 8, left: 8, bottom: 20, right: 8))
marker.type = TripBehavior(rawValue: event!.type)
marker.chartView = chartView
marker.minimumSize = CGSize(width: 80, height: 40)
chartView.marker = marker

chartView.legend.form = .line
chartView.animate(xAxisDuration: 2.5)
}

private func configureChartView(details: [JSON]?) {
guard let details = details else {return}
guard let event = self.event else {return}

var values = [Float]()
if event.type == TripBehavior.speedDown.rawValue || event.type == TripBehavior.speedUp.rawValue {
values = details.map {$0["ax"].floatValue}
} else if event.type == TripBehavior.hurryTurn.rawValue {
values = details.map{$0["gz"].floatValue}
}
guard values.count > 0 else {return}

let chartValues = (0.. ChartDataEntry in
return ChartDataEntry.init(x: Double(i)/100, y: Double(values[i]))
}

let set1 = LineChartDataSet(values: chartValues, label: event.des)
set1.drawIconsEnabled = false
set1.lineDashLengths = [1, 0]
set1.highlightLineDashLengths = [1, 0]
set1.setColor(TripBehavior(rawValue: event.type)?.chartColor() ?? UIColor.red)
set1.lineWidth = 1
set1.circleRadius = 0
set1.drawCircleHoleEnabled = false
set1.valueTextColor = UIColor.clear
set1.drawFilledEnabled = false
set1.mode = .horizontalBezier

let data = LineChartData(dataSet: set1)

chartView.data = data
}
`