Performance issue with QML QChart

I am using QML bindings for Charts.js, which is based on HTML5 javascript library using the canvas element.

I am trying to use a LinePlot and add data to it during run time. But it gets really slow just a few seconds after i start it.

I am not sure if my code is the reason for the slowdown or the library. Is there anything I can optimize to make my plot behave more smoothly?

I have made the RealtimePlot component below:

import QtQuick 2.0
import jbQuick.Charts 1.0


Rectangle {
    property var label: []
    property var values: []
    property int length: 0

    Timer {
        id: dataTimer
        interval: 100
        repeat: true
        onTriggered: addData([5, 10])
    }

    Timer {
        id: plotUpdateTimer
        interval: 100
        repeat: true
        running: true
        onTriggered: {
            chart.repaint()
        }
    }

    Chart {
        id: chart
        height: parent.height
        width: parent.width
        chartAnimated: false
        //chartAnimationEasing: Easing.InOutElastic
        //chartAnimationDuration: 2
        chartType: Charts.ChartType.LINE
        Component.onCompleted: {

            //Start simulated data timer.
            dataTimer.start()

            //Set data visual properties and data/label variables.
            chartData = {
                labels: label,
                datasets: [
                    {
                        label: "Dataset",
                        fillColor: "rgba(220,220,220,0.2)",
                        strokeColor: "rgba(220,220,220,1)",
                        pointColor: "rgba(220,220,220,1)",
                        pointStrokeColor: "#fff",
                        pointHighlightFill: "#fff",
                        pointHighlightStroke: "rgba(220,220,220,1)",
                        data: values
                    },
                ]
            };
        }
    }

    function addData(data)
    {
        //Add new labels/values.
        for (var i = length; i < (length + data.length); i++)
        {
            label.push(i)
            values.push(data[i - length])
        }

        //Update total labels/values length.
        length += data.length
    }
}