RadCartesianChart hangs when using ScatterLineSeries with sliding ObservableCollection on iOS

//this is called once during the setup of the control
var data = new ObservableCollection<SeriesData>();

                ScatterLineSeries lineSeries = new ScatterLineSeries()
                {
                    DisplayName = series.Name,
                    XValueBinding = new PropertyNameDataPointBinding(nameof(SeriesData.XScaled)),
                    YValueBinding = new PropertyNameDataPointBinding(nameof(SeriesData.YScaled)),
                    ItemsSource = data,
                };
chart.Series.Add(lineSeries);

//this is called periodically as new data is available to display
public void AddSeriesData(IEnumerable<SeriesData> data)
    {
        float? min = null;
        float? max = null;

        lock (_data)
        {
            foreach (var d in data)
            {
                d.XScaled = d.X;
                d.YScaled = ((d.Y ?? 0) - d.Series.MinValue) / (d.Series.MaxValue - d.Series.MinValue) * 100;

                if (_data.TryGetValue(d.Series, outvar collection))
                {
                    collection.Add(d);
                   
                        max = d.XScaled;
                        
                        min = collection[0].XScaled;
                        while (max - min > settings.XAxisRange)
                        {
//application will start to hang here, once items are removed from beginning of the collection
                            collection.RemoveAt(0);
                            min = collection[0].XScaled;
                        }
                }
            }
        }

        if (max != null)
        {
            xAxis.Maximum = max.Value;
            xAxis.Minimum = max.Value - settings.XAxisRange;
        }
    }
 

public class SeriesData
    {
        public readonly Series Series;
        public readonly float? X;
        public readonly float? Y;

        public float? XScaled { get; internal set; }
        public float? YScaled { get; internal set; }

        public SeriesData(Series series, float? x, float? y)
        {
            Series = series;
            X = x;
            Y = y;
        }
    }