diff --git a/zero.Core/Blueprints/Blueprint.cs b/zero.Core/Blueprints/Blueprint.cs
index 02061b48..3642883a 100644
--- a/zero.Core/Blueprints/Blueprint.cs
+++ b/zero.Core/Blueprints/Blueprint.cs
@@ -15,6 +15,8 @@ namespace zero.Core.Blueprints
   {
     public List<BlueprintField<T>> UnlockedFields { get; private set; } = new();
 
+    protected static string[] DefaultFields { get; set; } = new[] { "name", "alias", "key", "sort", "isActive", "hash", "languageId", "createdById", "createdDate", "lastModifiedById", "lastModifiedDate", "blueprint" };
+
 
     public Blueprint() : base(typeof(T))
     {
@@ -40,8 +42,8 @@ namespace zero.Core.Blueprints
       }
 
       // copy all properties which are synced from the blueprint to the model
-      ObjectTraverser.CopyProperties(blueprint, model, model.Blueprint.Desync);
       ApplyDefaults(blueprint, model);
+      ObjectCloner.CopyProperties(blueprint, model, DefaultFields.Union(model.Blueprint.Desync).ToArray());
 
       return model;
     }
diff --git a/zero.Core/Utils/ObjectCloner.cs b/zero.Core/Utils/ObjectCloner.cs
new file mode 100644
index 00000000..0c76c979
--- /dev/null
+++ b/zero.Core/Utils/ObjectCloner.cs
@@ -0,0 +1,72 @@
+using System;
+using System.Collections;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+
+namespace zero.Core.Utils
+{
+  public class ObjectCloner
+  {
+    const string SEPARATOR = ".";
+
+    static Type STRING_TYPE = typeof(string);
+
+    static ConcurrentDictionary<string, IEnumerable<PropertyInfo>> PublicPropertiesPerType { get; set; } = new();
+
+
+
+    public static T CopyProperties<T>(T source, T target, params string[] exceptions)
+    {
+      return CopyPropertiesInternal(source, target, null, exceptions);
+    }
+
+
+    static T CopyPropertiesInternal<T>(T source, T target, string keyPrefix = null, params string[] exceptions)
+    {
+      Type type = source.GetType();
+
+      if (!PublicPropertiesPerType.TryGetValue(type.FullName, out IEnumerable<PropertyInfo> properties))
+      {
+        properties = type.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance).Where(x => x.CanWrite);
+        PublicPropertiesPerType.TryAdd(type.FullName, properties);
+      }
+
+      foreach (PropertyInfo property in properties)
+      {
+        string propertyNameWithPrefix = CombineKey(SEPARATOR, keyPrefix, property.Name);
+
+        if (exceptions.Contains(propertyNameWithPrefix, StringComparer.InvariantCultureIgnoreCase))
+        {
+          continue;
+        }
+
+        object propertyValue = property.GetValue(source, null);
+
+        if (property.PropertyType.IsValueType || property.PropertyType.IsEnum || property.PropertyType.Equals(STRING_TYPE) || propertyValue == null || propertyValue is IEnumerable)
+        {
+          Console.WriteLine("copy: " + propertyNameWithPrefix);
+          property.SetValue(target, propertyValue, null);
+        }
+        else if (property.PropertyType.IsClass)
+        {
+          string[] nestedExceptions = exceptions.Where(x => x.StartsWith(propertyNameWithPrefix, StringComparison.InvariantCultureIgnoreCase)).ToArray();
+          property.SetValue(target, CopyPropertiesInternal(propertyValue, property.GetValue(target, null), propertyNameWithPrefix, nestedExceptions), null);
+        }
+      }
+
+      return target;
+    }
+
+
+    private static string CombineKey(string sep, string key1, string key2)
+    {
+      if (String.IsNullOrEmpty(key1))
+      {
+        return key2;
+      }
+      return String.Join(sep, key1, key2);
+    }
+  }
+}
diff --git a/zero.Core/Utils/ObjectTraverser.cs b/zero.Core/Utils/ObjectTraverser.cs
index 9f1c9abc..fd5dbafe 100644
--- a/zero.Core/Utils/ObjectTraverser.cs
+++ b/zero.Core/Utils/ObjectTraverser.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -238,36 +239,6 @@ namespace zero.Core.Utils
     }
 
 
-    public static T CopyProperties<T>(T source, T target, params string[] exceptions)
-    {
-      Type sourceType = source.GetType();
-      Type stringType = typeof(System.String);
-
-      foreach (PropertyInfo sourceProperty in sourceType.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
-      {
-        Console.WriteLine("key: " + sourceProperty.Name);
-
-        if (!sourceProperty.CanWrite || exceptions.Contains(sourceProperty.Name, StringComparer.InvariantCultureIgnoreCase))
-        {
-          continue;
-        }
-
-        object sourcePropertyValue = sourceProperty.GetValue(source, null);
-
-        if (sourceProperty.PropertyType.IsValueType || sourceProperty.PropertyType.IsEnum || sourceProperty.PropertyType.Equals(stringType) || sourcePropertyValue == null || sourcePropertyValue is ICollection)
-        {
-          sourceProperty.SetValue(target, sourcePropertyValue, null);
-        }
-        else if (sourceProperty.PropertyType.IsClass)
-        {
-          sourceProperty.SetValue(target, CopyProperties(sourcePropertyValue, sourceProperty.GetValue(target, null)), null);
-        }
-      }
-
-      return target;
-    }
-
-
     private static string CombineKey(string sep, string key1, string key2)
     {
       if (String.IsNullOrEmpty(key1))