Add benchmark for async disposal

osu.Framework.Benchmarks/BenchmarkAsyncDisposal.cs

@@ -0,0 +1,35 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using BenchmarkDotNet.Attributes;
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Shapes;
+
+namespace osu.Framework.Benchmarks
+{
+    [MemoryDiagnoser]
+    public partial class BenchmarkAsyncDisposal
+    {
+        private readonly List<Drawable> objects = new List<Drawable>();
+
+        [GlobalSetup]
+        [OneTimeSetUp]
+        public virtual void SetUp()
+        {
+            objects.Clear();
+            for (int i = 0; i < 10000; i++)
+                objects.Add(new Box());
+        }
+
+        [Test]
+        [Benchmark]
+        public void Run()
+        {
+            objects.ForEach(AsyncDisposalQueue.Enqueue);
+            AsyncDisposalQueue.WaitForEmpty();
+        }
+    }
+}