Optimizations in Chart control

maui/src/Charts/Area/Partial/CartesianChartArea.cs

@@ -61,7 +61,7 @@ internal void CalculateSbsPosition()
 			}
 
 			SideBySideSeriesPosition = [];
-			var cartesianSeriesCollection = visibleSeries.OfType<CartesianSeries>();
+			var cartesianSeriesCollection = visibleSeries.OfType<CartesianSeries>().ToList();
 
 			foreach (var cartesianSeries in cartesianSeriesCollection)
 			{

maui/src/Charts/Behaviors/ChartTrackballBehavior.cs

@@ -1707,11 +1707,12 @@ float FindLeastXValue(float pointX, float pointY)
 
 			}
 
+			var leastXPointsSet = new HashSet<TrackballPointInfo>(leastXPointsInfo);
 			var copyList = PointInfos.ToList();
 
 			foreach (var pointInfo in copyList)
 			{
-				if (!leastXPointsInfo.Contains(pointInfo))
+				if (!leastXPointsSet.Contains(pointInfo))
 				{
 					RemoveTrackballInfo(pointInfo);
 				}

maui/src/Charts/Behaviors/DataPointSelectionBehavior.cs

@@ -125,4 +125,4 @@ internal override void SelectionIndexesPropertyChanged(List<int> newValue)
 
 		#endregion
 	}
-}
+}

maui/src/Charts/Behaviors/SeriesSelectionBehavior.cs

@@ -135,4 +135,4 @@ internal override void SelectionIndexesPropertyChanged(List<int> newValue)
 
 		#endregion
 	}
-}
+}

maui/src/Charts/Series/AreaSeries.cs

@@ -439,8 +439,9 @@ public override int GetDataPointIndex(float pointX, float pointY)
 				}
 
 				List<PointF> segPoints = [];
-				foreach (AreaSegment segment in _segments.Cast<AreaSegment>())
+				foreach (ChartSegment item in _segments)
 				{
+					AreaSegment segment = (AreaSegment)item;
 					var points = segment.FillPoints;
 					if (points != null)
 					{

maui/src/Charts/Series/BoxAndWhiskerSeries.cs

@@ -1109,8 +1109,18 @@ internal override void GenerateSegments(SeriesView seriesView)
 
 				if (outliers.Count > 0)
 				{
-					actualMinimum = Math.Min(outliers.Min(), actualMinimum);
-					actualMaximum = Math.Max(outliers.Max(), actualMaximum);
+					for (int j = 0; j < outliers.Count; j++)
+					{
+						if (outliers[j] < actualMinimum)
+						{
+							actualMinimum = outliers[j];
+						}
+
+						if (outliers[j] > actualMaximum)
+						{
+							actualMaximum = outliers[j];
+						}
+					}
 				}
 
 				if (xValues != null)

maui/src/Charts/Series/CircularSeries.cs

@@ -534,8 +534,9 @@ protected internal override void DrawDataLabel(ICanvas canvas, Brush? fillColor,
 
 		internal void UpdateDataLabelPositions(ICanvas canvas)
 		{
-			foreach (PieSegment segment in _segments.Cast<PieSegment>())
+			foreach (ChartSegment item in _segments)
 			{
+				PieSegment segment = (PieSegment)item;
 				if (IsSegmentWithinBounds(segment) && segment.IsVisible)
 				{
 					DrawConnectorLine(canvas, segment);

maui/src/Charts/Series/FinancialSeriesBase.cs

@@ -700,8 +700,9 @@ internal override void DrawDataLabels(ICanvas canvas)
 
 			ChartDataLabelStyle labelStyle = dataLabelSettings.LabelStyle;
 
-			foreach (HiLoOpenCloseSegment dataLabel in _segments.Cast<HiLoOpenCloseSegment>())
+			foreach (ChartSegment item in _segments)
 			{
+				HiLoOpenCloseSegment dataLabel = (HiLoOpenCloseSegment)item;
 				if (!dataLabel.InVisibleRange || dataLabel.IsZero)
 				{
 					continue;

maui/src/Charts/Series/RangeAreaSeries.cs

@@ -558,8 +558,9 @@ internal override void DrawDataLabels(ICanvas canvas)
 
             ChartDataLabelStyle labelStyle = DataLabelSettings.LabelStyle;
 
-            foreach (RangeAreaSegment dataLabel in _segments.Cast<RangeAreaSegment>())
+            foreach (ChartSegment item in _segments)
             {
+                RangeAreaSegment dataLabel = (RangeAreaSegment)item;
                 if (dataLabel == null || dataLabel.XValues == null || dataLabel.HighValues == null || dataLabel.LowValues == null)
                 {
                     return;

maui/src/Charts/Series/ScatterSeries.cs

@@ -492,9 +492,10 @@ void CreateSegment(SeriesView seriesView, double x, double y, int index)
 
 		void UpdateScatterType(ShapeType type)
 		{
-			foreach (ScatterSegment item in _segments.Cast<ScatterSegment>())
+			foreach (ChartSegment item in _segments)
 			{
-				item.Type = type;
+				ScatterSegment scatterItem = (ScatterSegment)item;
+				scatterItem.Type = type;
 			}
 		}
 

maui/src/Charts/Series/StepAreaSeries.cs

@@ -92,8 +92,9 @@ public override int GetDataPointIndex(float pointX, float pointY)
 
 			List<PointF> segPoints = [];
 
-			foreach (StepAreaSegment segment in _segments.Cast<StepAreaSegment>())
+			foreach (ChartSegment item in _segments)
 			{
+				StepAreaSegment segment = (StepAreaSegment)item;
 				var points = segment.FillPoints;
 				if (points != null)
 				{