diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index 1951543f..2c6428d6 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -1257,35 +1257,7 @@ public static class ConfigHandler
             var tun2SocksAddress = node.Address;
             if (node.ConfigType > EConfigType.Group)
             {
-                static async Task<List<string>> GetChildNodeAddressesAsync(string parentIndexId)
-                {
-                    var childAddresses = new List<string>();
-                    if (!ProfileGroupItemManager.Instance.TryGet(parentIndexId, out var groupItem) || groupItem.ChildItems.IsNullOrEmpty())
-                        return childAddresses;
-
-                    var childIds = Utils.String2List(groupItem.ChildItems);
-
-                    foreach (var childId in childIds)
-                    {
-                        var childNode = await AppManager.Instance.GetProfileItem(childId);
-                        if (childNode == null)
-                            continue;
-
-                        if (!childNode.IsComplex())
-                        {
-                            childAddresses.Add(childNode.Address);
-                        }
-                        else if (childNode.ConfigType > EConfigType.Group)
-                        {
-                            var subAddresses = await GetChildNodeAddressesAsync(childNode.IndexId);
-                            childAddresses.AddRange(subAddresses);
-                        }
-                    }
-
-                    return childAddresses;
-                }
-
-                var lstAddresses = await GetChildNodeAddressesAsync(node.IndexId);
+                var lstAddresses = (await ProfileGroupItemManager.GetAllChildDomainAddresses(node.IndexId)).ToList();
                 if (lstAddresses.Count > 0)
                 {
                     tun2SocksAddress = Utils.List2String(lstAddresses);
diff --git a/v2rayN/ServiceLib/Manager/AppManager.cs b/v2rayN/ServiceLib/Manager/AppManager.cs
index f131adf8..a41ceae6 100644
--- a/v2rayN/ServiceLib/Manager/AppManager.cs
+++ b/v2rayN/ServiceLib/Manager/AppManager.cs
@@ -100,7 +100,6 @@ public sealed class AppManager
 
             await ConfigHandler.SaveConfig(_config);
             await ProfileExManager.Instance.SaveTo();
-            await ProfileGroupItemManager.Instance.SaveTo();
             await StatisticsManager.Instance.SaveTo();
             await CoreManager.Instance.CoreStop();
             StatisticsManager.Instance.Close();
diff --git a/v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs b/v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs
index 4812a0d2..447e7433 100644
--- a/v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs
+++ b/v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs
@@ -164,4 +164,113 @@ public class ProfileGroupItemManager
             Logging.SaveLog(_tag, ex);
         }
     }
+
+    #region Helper
+
+    public static bool HasCycle(string? indexId)
+    {
+        return HasCycle(indexId, new HashSet<string>(), new HashSet<string>());
+    }
+
+    public static bool HasCycle(string? indexId, HashSet<string> visited, HashSet<string> stack)
+    {
+        if (indexId.IsNullOrEmpty())
+            return false;
+
+        if (stack.Contains(indexId))
+            return true;
+
+        if (visited.Contains(indexId))
+            return false;
+
+        visited.Add(indexId);
+        stack.Add(indexId);
+
+        Instance.TryGet(indexId, out var groupItem);
+
+        if (groupItem == null || groupItem.ChildItems.IsNullOrEmpty())
+        {
+            return false;
+        }
+
+        var childIds = Utils.String2List(groupItem.ChildItems)
+            .Where(p => !string.IsNullOrEmpty(p))
+            .ToList();
+
+        foreach (var child in childIds)
+        {
+            if (HasCycle(child, visited, stack))
+            {
+                return true;
+            }
+        }
+
+        stack.Remove(indexId);
+        return false;
+    }
+
+    public static async Task<(List<ProfileItem> Items, ProfileGroupItem? Group)> GetChildProfileItems(string? indexId)
+    {
+        Instance.TryGet(indexId, out var profileGroupItem);
+        if (profileGroupItem == null || profileGroupItem.ChildItems.IsNullOrEmpty())
+        {
+            return (new List<ProfileItem>(), profileGroupItem);
+        }
+        var items = await GetChildProfileItems(profileGroupItem);
+        return (items, profileGroupItem);
+    }
+
+    public static async Task<List<ProfileItem>> GetChildProfileItems(ProfileGroupItem? group)
+    {
+        if (group == null || group.ChildItems.IsNullOrEmpty())
+        {
+            return new();
+        }
+        var childProfiles = (await Task.WhenAll(
+                Utils.String2List(group.ChildItems)
+                    .Where(p => !p.IsNullOrEmpty())
+                    .Select(AppManager.Instance.GetProfileItem)
+            ))
+            .Where(p =>
+                p != null &&
+                p.IsValid() &&
+                p.ConfigType != EConfigType.Custom
+            )
+            .ToList();
+        return childProfiles;
+    }
+
+    public static async Task<HashSet<string>> GetAllChildDomainAddresses(string parentIndexId)
+    {
+        // include grand children
+        var childAddresses = new HashSet<string>();
+        if (!Instance.TryGet(parentIndexId, out var groupItem) || groupItem.ChildItems.IsNullOrEmpty())
+            return childAddresses;
+
+        var childIds = Utils.String2List(groupItem.ChildItems);
+
+        foreach (var childId in childIds)
+        {
+            var childNode = await AppManager.Instance.GetProfileItem(childId);
+            if (childNode == null)
+                continue;
+
+            if (!childNode.IsComplex())
+            {
+                childAddresses.Add(childNode.Address);
+            }
+            else if (childNode.ConfigType > EConfigType.Group)
+            {
+                var subAddresses = await GetAllChildDomainAddresses(childNode.IndexId);
+                foreach (var addr in subAddresses)
+                {
+                    childAddresses.Add(addr);
+                }
+            }
+        }
+
+        return childAddresses;
+    }
+
+    #endregion Helper
 }
diff --git a/v2rayN/ServiceLib/Manager/TaskManager.cs b/v2rayN/ServiceLib/Manager/TaskManager.cs
index c626e1b7..dfbd242d 100644
--- a/v2rayN/ServiceLib/Manager/TaskManager.cs
+++ b/v2rayN/ServiceLib/Manager/TaskManager.cs
@@ -35,7 +35,6 @@ public class TaskManager
 
                 await ConfigHandler.SaveConfig(_config);
                 await ProfileExManager.Instance.SaveTo();
-                await ProfileGroupItemManager.Instance.SaveTo();
             }
 
             //Execute once 1 hour
diff --git a/v2rayN/ServiceLib/Models/ProfileGroupItem.cs b/v2rayN/ServiceLib/Models/ProfileGroupItem.cs
index bb1615ae..6fbe1d9c 100644
--- a/v2rayN/ServiceLib/Models/ProfileGroupItem.cs
+++ b/v2rayN/ServiceLib/Models/ProfileGroupItem.cs
@@ -11,48 +11,4 @@ public class ProfileGroupItem
     public string ChildItems { get; set; }
 
     public EMultipleLoad MultipleLoad { get; set; } = EMultipleLoad.LeastPing;
-
-    public bool HasCycle()
-    {
-        return HasCycle(new HashSet<string>(), new HashSet<string>());
-    }
-
-    public bool HasCycle(HashSet<string> visited, HashSet<string> stack)
-    {
-        if (string.IsNullOrEmpty(ParentIndexId))
-            return false;
-
-        if (stack.Contains(ParentIndexId))
-            return true;
-
-        if (visited.Contains(ParentIndexId))
-            return false;
-
-        visited.Add(ParentIndexId);
-        stack.Add(ParentIndexId);
-
-        if (string.IsNullOrEmpty(ChildItems))
-        {
-            return false;
-        }
-
-        var childIds = Utils.String2List(ChildItems)
-            .Where(p => !string.IsNullOrEmpty(p))
-            .ToList();
-
-        var childProfiles = childIds.Select(ProfileGroupItemManager.Instance.GetOrDefault)//这里是内存访问
-            .Where(p => p != null)
-            .ToList();
-
-        foreach (var child in childProfiles)
-        {
-            if (child.HasCycle(visited, stack))
-            {
-                return true;
-            }
-        }
-
-        stack.Remove(ParentIndexId);
-        return false;
-    }
 }
diff --git a/v2rayN/ServiceLib/Models/ProfileItem.cs b/v2rayN/ServiceLib/Models/ProfileItem.cs
index 8f883535..da34600b 100644
--- a/v2rayN/ServiceLib/Models/ProfileItem.cs
+++ b/v2rayN/ServiceLib/Models/ProfileItem.cs
@@ -109,42 +109,6 @@ public class ProfileItem : ReactiveObject
         return true;
     }
 
-    public async Task<bool> HasCycle(HashSet<string> visited, HashSet<string> stack)
-    {
-        if (ConfigType < EConfigType.Group)
-            return false;
-
-        if (stack.Contains(IndexId))
-            return true;
-
-        if (visited.Contains(IndexId))
-            return false;
-
-        visited.Add(IndexId);
-        stack.Add(IndexId);
-
-        if (ProfileGroupItemManager.Instance.TryGet(IndexId, out var group)
-            && !group.ChildItems.IsNullOrEmpty())
-        {
-            var childProfiles = (await Task.WhenAll(
-                    Utils.String2List(group.ChildItems)
-                        .Where(p => !p.IsNullOrEmpty())
-                        .Select(AppManager.Instance.GetProfileItem)
-                ))
-                .Where(p => p != null)
-                .ToList();
-
-            foreach (var child in childProfiles)
-            {
-                if (await child.HasCycle(visited, stack))
-                    return true;
-            }
-        }
-
-        stack.Remove(IndexId);
-        return false;
-    }
-
     #endregion function
 
     [PrimaryKey]
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
index e114b433..08005725 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
@@ -212,33 +212,13 @@ public partial class CoreConfigSingboxService
             {
                 return -1;
             }
-            ProfileGroupItemManager.Instance.TryGet(node.IndexId, out var profileGroupItem);
-            if (profileGroupItem is null || profileGroupItem.ChildItems.IsNullOrEmpty())
-            {
-                return -1;
-            }
-
-            var hasCycle = await node.HasCycle(new HashSet<string>(), new HashSet<string>());
+            var hasCycle = ProfileGroupItemManager.HasCycle(node.IndexId);
             if (hasCycle)
             {
                 return -1;
             }
 
-            // remove custom nodes
-            // remove group nodes for proxy chain
-            var childProfiles = (await Task.WhenAll(
-                    Utils.String2List(profileGroupItem.ChildItems)
-                        .Where(p => !p.IsNullOrEmpty())
-                        .Select(AppManager.Instance.GetProfileItem)
-                ))
-                .Where(p =>
-                    p != null
-                    && p.IsValid()
-                    && p.ConfigType != EConfigType.Custom
-                    && (node.ConfigType == EConfigType.PolicyGroup || p.ConfigType < EConfigType.Group)
-                )
-                .ToList();
-
+            var (childProfiles, profileGroupItem) = await ProfileGroupItemManager.GetChildProfileItems(node.IndexId);
             if (childProfiles.Count <= 0)
             {
                 return -1;
@@ -514,16 +494,13 @@ public partial class CoreConfigSingboxService
 
                 if (node.ConfigType is EConfigType.PolicyGroup or EConfigType.ProxyChain)
                 {
-                    ProfileGroupItemManager.Instance.TryGet(node.IndexId, out var profileGroupItem);
-                    if (profileGroupItem == null || profileGroupItem.ChildItems.IsNullOrEmpty())
+                    var hasCycle = ProfileGroupItemManager.HasCycle(node.IndexId);
+                    if (hasCycle)
                     {
-                        continue;
+                        return -1;
                     }
-                    var childProfiles = (await Task.WhenAll(
-                            Utils.String2List(profileGroupItem.ChildItems)
-                            .Where(p => !p.IsNullOrEmpty())
-                            .Select(AppManager.Instance.GetProfileItem)
-                        )).Where(p => p != null).ToList();
+
+                    var (childProfiles, profileGroupItem) = await ProfileGroupItemManager.GetChildProfileItems(node.IndexId);
                     if (childProfiles.Count <= 0)
                     {
                         continue;
@@ -698,16 +675,13 @@ public partial class CoreConfigSingboxService
                 continue;
             if (node.ConfigType is EConfigType.PolicyGroup or EConfigType.ProxyChain)
             {
-                ProfileGroupItemManager.Instance.TryGet(node.IndexId, out var profileGroupItem);
-                if (profileGroupItem == null || profileGroupItem.ChildItems.IsNullOrEmpty())
+                var hasCycle = ProfileGroupItemManager.HasCycle(node.IndexId);
+                if (hasCycle)
                 {
-                    continue;
+                    return -1;
                 }
-                var childProfiles = (await Task.WhenAll(
-                        Utils.String2List(profileGroupItem.ChildItems)
-                        .Where(p => !p.IsNullOrEmpty())
-                        .Select(AppManager.Instance.GetProfileItem)
-                    )).Where(p => p != null).ToList();
+
+                var (childProfiles, profileGroupItem) = await ProfileGroupItemManager.GetChildProfileItems(node.IndexId);
                 if (childProfiles.Count <= 0)
                 {
                     continue;
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
index 2fbf42b5..4c3a5148 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
@@ -1,5 +1,3 @@
-using ServiceLib.Models;
-
 namespace ServiceLib.Services.CoreConfig;
 
 public partial class CoreConfigV2rayService
@@ -490,34 +488,13 @@ public partial class CoreConfigV2rayService
             {
                 return -1;
             }
-            ProfileGroupItemManager.Instance.TryGet(node.IndexId, out var profileGroupItem);
-            if (profileGroupItem is null || profileGroupItem.ChildItems.IsNullOrEmpty())
-            {
-                return -1;
-            }
-
-            var hasCycle = profileGroupItem.HasCycle();
-            //var hasCycle = await node.HasCycle(new HashSet<string>(), new HashSet<string>());
+            var hasCycle = ProfileGroupItemManager.HasCycle(node.IndexId);
             if (hasCycle)
             {
                 return -1;
             }
 
-            // remove custom nodes
-            // remove group nodes for proxy chain
-            var childProfiles = (await Task.WhenAll(
-                    Utils.String2List(profileGroupItem.ChildItems)
-                        .Where(p => !p.IsNullOrEmpty())
-                        .Select(AppManager.Instance.GetProfileItem)
-                ))
-                .Where(p =>
-                    p != null &&
-                    p.IsValid() &&
-                    p.ConfigType != EConfigType.Custom &&
-                    (node.ConfigType == EConfigType.PolicyGroup || p.ConfigType < EConfigType.Group)
-                )
-                .ToList();
-
+            var (childProfiles, profileGroupItem) = await ProfileGroupItemManager.GetChildProfileItems(node.IndexId);
             if (childProfiles.Count <= 0)
             {
                 return -1;
@@ -654,16 +631,13 @@ public partial class CoreConfigV2rayService
 
                 if (node.ConfigType is EConfigType.PolicyGroup or EConfigType.ProxyChain)
                 {
-                    ProfileGroupItemManager.Instance.TryGet(node.IndexId, out var profileGroupItem);
-                    if (profileGroupItem == null || profileGroupItem.ChildItems.IsNullOrEmpty())
+                    var hasCycle = ProfileGroupItemManager.HasCycle(node.IndexId);
+                    if (hasCycle)
                     {
-                        continue;
+                        return -1;
                     }
-                    var childProfiles = (await Task.WhenAll(
-                            Utils.String2List(profileGroupItem.ChildItems)
-                            .Where(p => !p.IsNullOrEmpty())
-                            .Select(AppManager.Instance.GetProfileItem)
-                        )).Where(p => p != null).ToList();
+
+                    var (childProfiles, _) = await ProfileGroupItemManager.GetChildProfileItems(node.IndexId);
                     if (childProfiles.Count <= 0)
                     {
                         continue;
@@ -814,16 +788,13 @@ public partial class CoreConfigV2rayService
                 continue;
             if (node.ConfigType is EConfigType.PolicyGroup or EConfigType.ProxyChain)
             {
-                ProfileGroupItemManager.Instance.TryGet(node.IndexId, out var profileGroupItem);
-                if (profileGroupItem == null || profileGroupItem.ChildItems.IsNullOrEmpty())
+                var hasCycle = ProfileGroupItemManager.HasCycle(node.IndexId);
+                if (hasCycle)
                 {
-                    continue;
+                    return -1;
                 }
-                var childProfiles = (await Task.WhenAll(
-                        Utils.String2List(profileGroupItem.ChildItems)
-                        .Where(p => !p.IsNullOrEmpty())
-                        .Select(AppManager.Instance.GetProfileItem)
-                    )).Where(p => p != null).ToList();
+
+                var (childProfiles, _) = await ProfileGroupItemManager.GetChildProfileItems(node.IndexId);
                 if (childProfiles.Count <= 0)
                 {
                     continue;