add a benchmark for inherited property change notifications.

tests/Avalonia.Benchmarks/Data/InheritedProperties.cs

@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using Avalonia.Controls;
+using Avalonia.UnitTests;
+using BenchmarkDotNet.Attributes;
+
+namespace Avalonia.Benchmarks.Data;
+
+[MemoryDiagnoser]
+public class InheritedProperties
+{
+    private readonly TestRoot _root;
+    private readonly List<Control> _controls = new();
+
+    public InheritedProperties()
+    {
+        var panel = new StackPanel();
+
+        _root = new TestRoot
+        {
+            Child = panel,
+            Renderer = new NullRenderer()
+        };
+
+        _controls.Add(panel);
+        _controls = ControlHierarchyCreator.CreateChildren(_controls, panel, 3, 5, 5);
+
+        _root.LayoutManager.ExecuteInitialLayoutPass();
+    }
+    
+    [Benchmark, MethodImpl(MethodImplOptions.NoInlining)]
+    public void ChangeDataContext()
+    {
+        TestDataContext[] dataContexts = [new(), new(), new()];
+            
+        for (int i = 0; i < 100; i++)
+        {
+            for (int j = 0; j < dataContexts.Length; j++)
+            {
+                _root.DataContext = dataContexts[j];
+            }
+        }
+    }
+
+    public class TestDataContext;
+}