diff --git a/v2rayN/ServiceLib.Tests/ViewModels/ClashProxiesViewModelTests.cs b/v2rayN/ServiceLib.Tests/ViewModels/ClashProxiesViewModelTests.cs
new file mode 100644
index 00000000..156c5961
--- /dev/null
+++ b/v2rayN/ServiceLib.Tests/ViewModels/ClashProxiesViewModelTests.cs
@@ -0,0 +1,113 @@
+using ReactiveUI.Builder;
+using ServiceLib.Tests.CoreConfig;
+using ServiceLib.ViewModels;
+
+namespace ServiceLib.Tests.ViewModels;
+
+[NotInParallel]
+public class ClashProxiesViewModelTests
+{
+    static ClashProxiesViewModelTests()
+    {
+        RxAppBuilder.CreateReactiveUIBuilder().WithCoreServices().BuildApp();
+    }
+
+    [Test]
+    [Arguments("Selector", true)]
+    [Arguments("URLTest", true)]
+    [Arguments("LoadBalance", true)]
+    [Arguments("Fallback", true)]
+    [Arguments("selector", true)]
+    [Arguments("SELECTOR", true)]
+    [Arguments("Direct", false)]
+    [Arguments(null, false)]
+    public async Task GroupDelay_ShouldTestAllowedGroupTypes(string? type, bool allowed)
+    {
+        var configField = typeof(AppManager).GetField("_config", BindingFlags.Instance | BindingFlags.NonPublic)!;
+        var portField = typeof(AppManager).GetField("_statePort2", BindingFlags.Instance | BindingFlags.NonPublic)!;
+        var viewConfigField = typeof(MyReactiveObject).GetField("_config", BindingFlags.Static | BindingFlags.NonPublic)!;
+        var previousConfig = configField.GetValue(AppManager.Instance);
+        var previousPort = portField.GetValue(AppManager.Instance);
+        var previousViewConfig = viewConfigField.GetValue(null);
+        await using var server = new DelayServer();
+        try
+        {
+            CoreConfigTestFactory.BindAppManagerConfig(CoreConfigTestFactory.CreateConfig());
+            portField.SetValue(AppManager.Instance, server.Port);
+            var viewModel = new ClashProxiesViewModel();
+            var item = new ClashItem();
+            item.Proxies.Add("test-group", new() { type = type, all = ["test-node"] });
+            item.Proxies.Add("test-node", new() { type = "Shadowsocks" });
+            typeof(ClashProxiesViewModel).GetField("_clashItem", BindingFlags.Instance | BindingFlags.NonPublic)!
+                .SetValue(viewModel, item);
+            viewModel.SelectedGroup = new ClashProxyModel { Name = "test-group" };
+
+            var method = typeof(ClashProxiesViewModel).GetMethod("TestGroupProxiesDelay", BindingFlags.Instance | BindingFlags.NonPublic)!;
+            await ((Task)method.Invoke(viewModel, null)!).WaitAsync(TimeSpan.FromSeconds(10));
+
+            await server.Requests.Count.Should().BeEqualTo(allowed ? 1 : 0);
+            await viewModel.ProxyDetails.Single().DelayName.Should().BeEqualTo(allowed ? "42ms" : string.Empty);
+            if (allowed)
+            {
+                await server.Requests.Single().StartsWith("GET /proxies/test-node/delay?").Should().BeTrue();
+            }
+        }
+        finally
+        {
+            configField.SetValue(AppManager.Instance, previousConfig);
+            portField.SetValue(AppManager.Instance, previousPort);
+            viewConfigField.SetValue(null, previousViewConfig);
+        }
+    }
+
+    private sealed class DelayServer : IAsyncDisposable
+    {
+        private readonly TcpListener _listener = new(IPAddress.Loopback, 0);
+        private readonly CancellationTokenSource _cancellation = new();
+        private readonly Task _serverTask;
+        public int Port => ((IPEndPoint)_listener.LocalEndpoint).Port;
+        public ConcurrentQueue<string> Requests { get; } = new();
+
+        public DelayServer()
+        {
+            _listener.Start();
+            _serverTask = ServeAsync();
+        }
+
+        private async Task ServeAsync()
+        {
+            var token = _cancellation.Token;
+            while (!token.IsCancellationRequested)
+            {
+                using var client = await _listener.AcceptTcpClientAsync(token);
+                await using var stream = client.GetStream();
+                using var reader = new StreamReader(stream, Encoding.ASCII, leaveOpen: true);
+                var request = await reader.ReadLineAsync(token);
+                while (await reader.ReadLineAsync(token) is { Length: > 0 })
+                {
+                }
+                Requests.Enqueue(request!);
+                const string body = "{\"delay\":42}";
+                var response = $"HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {body.Length}\r\nConnection: close\r\n\r\n{body}";
+                await stream.WriteAsync(Encoding.ASCII.GetBytes(response), token);
+            }
+        }
+
+        public async ValueTask DisposeAsync()
+        {
+            await _cancellation.CancelAsync();
+            _listener.Stop();
+            try
+            {
+                await _serverTask;
+            }
+            catch (OperationCanceledException)
+            {
+            }
+            finally
+            {
+                _cancellation.Dispose();
+            }
+        }
+    }
+}
diff --git a/v2rayN/ServiceLib/ViewModels/ClashProxiesViewModel.cs b/v2rayN/ServiceLib/ViewModels/ClashProxiesViewModel.cs
index 7d61dc50..d3fe3cd2 100644
--- a/v2rayN/ServiceLib/ViewModels/ClashProxiesViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/ClashProxiesViewModel.cs
@@ -359,7 +359,7 @@ public partial class ClashProxiesViewModel : MyReactiveObject
     private async Task TestGroupProxiesDelay()
     {
         var groupProxy = TryGetProxy(SelectedGroup.Name);
-        if (!Global.allowSelectType.Contains(groupProxy?.type))
+        if (!Global.allowSelectType.Contains(groupProxy?.type, StringComparer.OrdinalIgnoreCase))
         {
             return;
         }