Benchmark for finding resources.

tests/Avalonia.Benchmarks/Styling/ResourceBenchmarks.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Platform;
+using Avalonia.PlatformSupport;
+using Avalonia.Styling;
+using Avalonia.Themes.Fluent;
+using Avalonia.UnitTests;
+using BenchmarkDotNet.Attributes;
+using Moq;
+
+namespace Avalonia.Benchmarks.Styling
+{
+    [MemoryDiagnoser]
+    public class ResourceBenchmarks : IDisposable
+    {
+        private readonly Control _searchStart;
+        private readonly IDisposable _app;
+    
+        private static IDisposable CreateApp()
+        {
+            var services = new TestServices(
+                assetLoader: new AssetLoader(),
+                globalClock: new MockGlobalClock(),
+                platform: new AppBuilder().RuntimePlatform,
+                renderInterface: new MockPlatformRenderInterface(),
+                standardCursorFactory: Mock.Of<ICursorFactory>(),
+                styler: new Styler(),
+                theme: () => LoadTheme(),
+                threadingInterface: new NullThreadingPlatform(),
+                fontManagerImpl: new MockFontManagerImpl(),
+                textShaperImpl: new MockTextShaperImpl(),
+                windowingPlatform: new MockWindowingPlatform());
+
+            return UnitTestApplication.Start(services);
+        }
+    
+        private static Styles LoadTheme()
+        {
+            AssetLoader.RegisterResUriParsers();
+            
+            var hostStyle = new Style();
+            
+            hostStyle.Resources.Add("test", null);
+            
+            return new Styles
+            {
+                hostStyle,
+                new FluentTheme(new Uri("avares://Avalonia.Benchmarks"))
+            };
+        }
+
+        public void Dispose()
+        {
+            _app.Dispose();
+        }
+        
+        public ResourceBenchmarks()
+        {
+            _searchStart = new Button();
+
+            _app = CreateApp();
+        
+            Decorator root = new TestRoot(true, null)
+            {
+                Renderer = new NullRenderer()
+            };
+        
+            var current = root;
+            
+            for (int i = 0; i < 10; i++)
+            {
+                var child = new Decorator();
+
+                current.Child = child;
+
+                current = child;
+            }
+
+            current.Child = _searchStart;
+        }
+        
+        [Benchmark(Baseline = true)]
+        public void FindResource()
+        {
+            for (int i = 0; i < 100; ++i)
+            {
+                _searchStart.FindResource("test");
+            }
+        }
+    }
+}