Improve shared reference handling & benchmark realism

- Test data now controls IId shared ref % for realistic deduplication benchmarks; display names include IId ref ratio.
- Added deep-level clearing of IId refs for realistic object graphs.
- Pallet, Measurement, and Point models now support shared IId refs.
- TestDataFactory passes shared refs to all hierarchy levels.
- Refactored TypeMetadataWrapper for type-specific Id getters, identity maps, and registration—removes hot path type checks/switches.
- AcBinary deserializer now uses new typed methods for reference tracking and registration.
- SerializationContextBase uses pre-cast Id getters for zero-overhead tracking.
- Reduced quick benchmark warmup iterations for faster startup.
- Improves performance, clarity, and maintainability of reference handling and benchmarks.

AyCode.Core.Serializers.Console/Program.cs

@@ -73,7 +73,7 @@ public static class Program
         foreach (var testData in testDataSets)
         {
             System.Console.WriteLine($"\n{'═'.ToString().PadRight(70, '═')}");
-            System.Console.WriteLine($"TEST DATA: {testData.Name}");
+            System.Console.WriteLine($"TEST DATA: {testData.DisplayName}");
             System.Console.WriteLine($"{'═'.ToString().PadRight(70, '═')}");
 
             var results = RunBenchmarksForTestData(testData, mode);
@@ -83,6 +83,8 @@ public static class Program
         // Print grouped results
         PrintGroupedResults(allResults, testDataSets);
 
+
+
         // Save results to file
         SaveResults(allResults, testDataSets);
 
@@ -106,22 +108,44 @@ public static class Program
     private static TestDataSet CreateSmallTestData()
     {
         TestDataFactory.ResetIdCounter();
+        
+        // Create shared references - IId types (only at Order/Item level)
+        var sharedTag = TestDataFactory.CreateTag("SharedTag");
+        var sharedUser = TestDataFactory.CreateUser("shareduser");
+        
         var order = TestDataFactory.CreateOrder(
             itemCount: 2,
             palletsPerItem: 2,
             measurementsPerPallet: 2,
-            pointsPerMeasurement: 2);
+            pointsPerMeasurement: 2,
+            sharedTag: sharedTag,
+            sharedUser: sharedUser);
         
-        return new TestDataSet("Small (2x2x2x2)", order);
+        // Clear deeper level refs for realistic ~10% ratio
+        ClearDeepLevelRefs(order);
+        
+        return new TestDataSet("Small (2x2x2x2)", order, iidRefPercent: 10);
     }
 
     private static TestDataSet CreateMediumTestData()
     {
         TestDataFactory.ResetIdCounter();
+        
+        // IId shared references
         var sharedTag = TestDataFactory.CreateTag("SharedTag");
         var sharedUser = TestDataFactory.CreateUser("shareduser");
         var sharedMeta = TestDataFactory.CreateMetadata("shared", withChild: true);
         
+        // Non-IId shared reference - create separate preferences for 2 users
+        var sharedPreferences = new UserPreferences
+        {
+            Theme = "dark",
+            Language = "en-US",
+            NotificationsEnabled = true,
+            EmailDigestFrequency = "weekly"
+        };
+        sharedUser.Preferences = sharedPreferences;
+
         var order = TestDataFactory.CreateOrder(
             itemCount: 3,
             palletsPerItem: 3,
@@ -129,37 +153,75 @@ public static class Program
             pointsPerMeasurement: 4,
             sharedTag: sharedTag,
             sharedUser: sharedUser,
-            sharedMetadata: sharedMeta);
+            sharedMetadata: sharedMeta,
+            sharedPreferences: sharedPreferences);
 
-        return new TestDataSet("Medium (3x3x3x4, shared refs)", order);
+        // Clear deeper level refs for realistic ~10% ratio
+        ClearDeepLevelRefs(order);
+
+        return new TestDataSet("Medium (3x3x3x4)", order, iidRefPercent: 10);
     }
 
     private static TestDataSet CreateLargeTestData()
     {
         TestDataFactory.ResetIdCounter();
+        
+        // IId shared references
         var sharedTag = TestDataFactory.CreateTag("SharedTag");
         var sharedUser = TestDataFactory.CreateUser("shareduser");
         
+        // Non-IId shared reference
+        var sharedPreferences = new UserPreferences
+        {
+            Theme = "light",
+            Language = "de-DE",
+            NotificationsEnabled = false,
+            EmailDigestFrequency = "daily"
+        };
+        sharedUser.Preferences = sharedPreferences;
+
         var order = TestDataFactory.CreateOrder(
             itemCount: 5,
             palletsPerItem: 5,
             measurementsPerPallet: 5,
             pointsPerMeasurement: 10,
             sharedTag: sharedTag,
-            sharedUser: sharedUser);
+            sharedUser: sharedUser,
+            sharedPreferences: sharedPreferences);
 
-        return new TestDataSet("Large (5x5x5x10)", order);
+        // Clear deeper level refs for realistic ~10% ratio
+        ClearDeepLevelRefs(order);
+
+        return new TestDataSet("Large (5x5x5x10)", order, iidRefPercent: 10);
     }
 
     private static TestDataSet CreateRepeatedStringsTestData()
     {
         TestDataFactory.ResetIdCounter();
+        
+        // IId shared references
+        var sharedTag = TestDataFactory.CreateTag("RepeatedTag");
+        var sharedUser = TestDataFactory.CreateUser("repeateduser");
+        
+        // Non-IId shared reference
+        var sharedPreferences = new UserPreferences
+        {
+            Theme = "dark",
+            Language = "en-US",
+            NotificationsEnabled = true,
+            EmailDigestFrequency = "weekly"
+        };
+        sharedUser.Preferences = sharedPreferences;
+        
         // Create order with many items to test string interning on repeated property names
         var order = TestDataFactory.CreateOrder(
             itemCount: 10,
             palletsPerItem: 2,
             measurementsPerPallet: 2,
-            pointsPerMeasurement: 2);
+            pointsPerMeasurement: 2,
+            sharedTag: sharedTag,
+            sharedUser: sharedUser,
+            sharedPreferences: sharedPreferences);
         
         // Set same status and ProductName on all items to test enum and string handling
         foreach (var item in order.Items)
@@ -168,19 +230,79 @@ public static class Program
             item.ProductName = "CommonProductName_RepeatedForTesting";
         }
         
-        return new TestDataSet("Repeated Strings (10 items)", order);
+        // Clear deeper level refs for realistic ~10% ratio
+        ClearDeepLevelRefs(order);
+
+        return new TestDataSet("Repeated Strings (10 items)", order, iidRefPercent: 10);
     }
     
+    /// <summary>
+    /// Clears IId shared references from Pallet, Measurement, and Point levels.
+    /// This creates a realistic ~10% IId ref ratio (only Order and Item levels have refs).
+    /// </summary>
+    private static void ClearDeepLevelRefs(TestOrder order)
+    {
+        foreach (var item in order.Items)
+        {
+            foreach (var pallet in item.Pallets)
+            {
+                pallet.Tag = null;
+                pallet.Inspector = null;
+                pallet.Category = null;
+                
+                foreach (var measurement in pallet.Measurements)
+                {
+                    measurement.Tag = null;
+                    measurement.Operator = null;
+                    
+                    foreach (var point in measurement.Points)
+                    {
+                        point.Tag = null;
+                        point.Verifier = null;
+                    }
+                }
+            }
+        }
+    }
+
+
+
+
+
+
     private static TestDataSet CreateDeepNestedTestData()
     {
         TestDataFactory.ResetIdCounter();
+        
+        // IId shared references - only at Order and Item levels for ~10% ratio
+        var sharedTag = TestDataFactory.CreateTag("DeepTag");
+        var sharedUser = TestDataFactory.CreateUser("deepuser");
+        var sharedCategory = TestDataFactory.CreateCategory("DeepCategory");
+        
+        // Non-IId shared reference
+        var sharedPreferences = new UserPreferences
+        {
+            Theme = "light",
+            Language = "fr-FR",
+            NotificationsEnabled = false,
+            EmailDigestFrequency = "monthly"
+        };
+        sharedUser.Preferences = sharedPreferences;
+        
         var order = TestDataFactory.CreateOrder(
             itemCount: 2,
             palletsPerItem: 4,
             measurementsPerPallet: 4,
-            pointsPerMeasurement: 8);
+            pointsPerMeasurement: 8,
+            sharedTag: sharedTag,
+            sharedUser: sharedUser,
+            sharedPreferences: sharedPreferences,
+            sharedCategory: sharedCategory);
         
-        return new TestDataSet("Deep Nested (2x4x4x8)", order);
+        // Clear deeper level refs for realistic ~10% ratio
+        ClearDeepLevelRefs(order);
+
+        return new TestDataSet("Deep Nested (2x4x4x8)", order, iidRefPercent: 10);
     }
 
     #endregion
@@ -206,7 +328,7 @@ public static class Program
         {
             var result = new BenchmarkResult
             {
-                TestDataName = testData.Name,
+                TestDataName = testData.DisplayName,  // Use DisplayName for IId% info
                 SerializerName = serializer.Name,
                 SerializedSize = serializer.SerializedSize
             };
@@ -465,13 +587,29 @@ public static class Program
         public string Name { get; }
         public TestOrder Order { get; }
         
-        public TestDataSet(string name, TestOrder order)
+        /// <summary>
+        /// Percentage of IId shared references in the data (0-100).
+        /// Higher values mean more deduplication benefit for Default mode.
+        /// </summary>
+        public int IIdRefPercent { get; }
+
+        public TestDataSet(string name, TestOrder order, int iidRefPercent = 0)
         {
             Name = name;
             Order = order;
+            IIdRefPercent = iidRefPercent;
         }
+        
+        /// <summary>
+        /// Gets display name including IId ref percentage if set.
+        /// </summary>
+        public string DisplayName => IIdRefPercent > 0 
+            ? $"{Name} [{IIdRefPercent}% IId refs]" 
+            : Name;
     }
 
+
+
     private sealed class BenchmarkResult
     {
         public string TestDataName { get; set; } = "";
@@ -498,11 +636,11 @@ public static class Program
 
         foreach (var testData in testDataSets)
         {
-            var testResults = results.Where(r => r.TestDataName == testData.Name).OrderBy(r => r.RoundTripTimeMs).ToList();
+            var testResults = results.Where(r => r.TestDataName == testData.DisplayName).OrderBy(r => r.RoundTripTimeMs).ToList();
             var msgPackResult = testResults.FirstOrDefault(r => r.SerializerName == SerializerMessagePack);
             var acBinaryResult = testResults.FirstOrDefault(r => r.SerializerName == SerializerAcBinaryDefault);
             
-            System.Console.WriteLine($"\n┌─ {testData.Name} ─".PadRight(98, '─') + "┐");
+            System.Console.WriteLine($"\n┌─ {testData.DisplayName} ─".PadRight(98, '─') + "┐");
             System.Console.WriteLine($"│ {"#",-4} │ {"Serializer",-25} │ {"Size",-10} │ {"Serialize",-12} │ {"Deserialize",-12} │ {"Round-trip",-12} │");
             System.Console.WriteLine($"├{"─".PadRight(6, '─')}┼{"─".PadRight(27, '─')}┼{"─".PadRight(12, '─')}┼{"─".PadRight(14, '─')}┼{"─".PadRight(14, '─')}┼{"─".PadRight(14, '─')}┤");
 

AyCode.Core.Tests/Serialization/QuickBenchmark.cs

@@ -402,7 +402,7 @@ public class QuickBenchmark
 
         // Warmup
         Console.WriteLine("\nWarming up...");
-        for (int i = 0; i < 100; i++)
+        for (int i = 0; i < 10; i++)
         {
             _ = AcBinarySerializer.Serialize(testOrder, withRefOptions);
             _ = AcBinarySerializer.Serialize(testOrder, noRefOptions);

AyCode.Core.Tests/TestModels/SharedTestModels.cs

@@ -218,7 +218,12 @@ public class TestPallet : IId<int>
     // Level 4 collection
     public List<TestMeasurement> Measurements { get; set; } = [];
 
-    // Shared references
+    // Shared IId references for better reference testing
+    public SharedTag? Tag { get; set; }
+    public SharedUser? Inspector { get; set; }
+    public SharedCategory? Category { get; set; }
+    
+    // Non-IId shared references
     public MetadataInfo? PalletMetadata { get; set; }
 
     // Parent reference - ignored by all serializers to prevent circular references
@@ -242,6 +247,10 @@ public class TestMeasurement : IId<int>
     // Level 5 collection
     public List<TestMeasurementPoint> Points { get; set; } = [];
 
+    // Shared IId references for better reference testing
+    public SharedTag? Tag { get; set; }
+    public SharedUser? Operator { get; set; }
+
     // Parent reference - ignored by all serializers to prevent circular references
     [JsonIgnore]
     [IgnoreMember]
@@ -260,6 +269,10 @@ public class TestMeasurementPoint : IId<int>
     public double Value { get; set; }
     public DateTime MeasuredAt { get; set; } = DateTime.UtcNow;
 
+    // Shared IId reference for better reference testing (many points share same tag/user)
+    public SharedTag? Tag { get; set; }
+    public SharedUser? Verifier { get; set; }
+
     // Parent reference - ignored by all serializers to prevent circular references
     [JsonIgnore]
     [IgnoreMember]

AyCode.Core.Tests/TestModels/TestDataFactory.cs

@@ -104,7 +104,8 @@ public static class TestDataFactory
     #region Hierarchy Creation (5 Levels)
 
     /// <summary>
-    /// Create a deep order hierarchy with configurable depth
+    /// Create a deep order hierarchy with configurable depth.
+    /// Supports both IId-based (SharedTag, SharedUser, SharedCategory) and Non-IId (UserPreferences) shared references.
     /// </summary>
     public static TestOrder CreateOrder(
         int itemCount = 2,
@@ -113,8 +114,13 @@ public static class TestDataFactory
         int pointsPerMeasurement = 3,
         SharedTag? sharedTag = null,
         SharedUser? sharedUser = null,
-        MetadataInfo? sharedMetadata = null)
+        MetadataInfo? sharedMetadata = null,
+        UserPreferences? sharedPreferences = null,
+        SharedCategory? sharedCategory = null)
     {
+        // If sharedUser is provided but no sharedPreferences, use the user's preferences as shared
+        sharedPreferences ??= sharedUser?.Preferences;
+        
         var order = new TestOrder
         {
             Id = _idCounter++,
@@ -125,6 +131,7 @@ public static class TestDataFactory
             PrimaryTag = sharedTag,
             SecondaryTag = sharedTag, // Same reference for $ref testing
             Owner = sharedUser,
+            Category = sharedCategory,
             OrderMetadata = sharedMetadata,
             AuditMetadata = sharedMetadata // Same reference for Newtonsoft $ref
         };
@@ -136,7 +143,15 @@ public static class TestDataFactory
 
         for (int i = 0; i < itemCount; i++)
         {
-            var item = CreateOrderItem(palletsPerItem, measurementsPerPallet, pointsPerMeasurement, sharedTag, sharedUser, sharedMetadata);
+            var item = CreateOrderItem(
+                palletsPerItem, 
+                measurementsPerPallet, 
+                pointsPerMeasurement, 
+                sharedTag, 
+                sharedUser, 
+                sharedMetadata, 
+                sharedPreferences,
+                sharedCategory);
             item.ParentOrder = order;
             order.Items.Add(item);
         }
@@ -145,7 +160,8 @@ public static class TestDataFactory
     }
 
     /// <summary>
-    /// Create an order item with pallets
+    /// Create an order item with pallets.
+    /// Supports both IId-based and Non-IId shared references.
     /// </summary>
     public static TestOrderItem CreateOrderItem(
         int palletCount = 2,
@@ -153,8 +169,19 @@ public static class TestDataFactory
         int pointsPerMeasurement = 3,
         SharedTag? sharedTag = null,
         SharedUser? sharedUser = null,
-        MetadataInfo? sharedMetadata = null)
+        MetadataInfo? sharedMetadata = null,
+        UserPreferences? sharedPreferences = null,
+        SharedCategory? sharedCategory = null)
     {
+        // Create assignee - if sharedUser provided, use it. Otherwise create new user with sharedPreferences
+        SharedUser? assignee = sharedUser;
+        if (assignee == null && sharedPreferences != null)
+        {
+            // Create a new user but with shared preferences (Non-IId ref testing)
+            assignee = CreateUser();
+            assignee.Preferences = sharedPreferences;
+        }
+        
         var item = new TestOrderItem
         {
             Id = _idCounter++,
@@ -163,13 +190,20 @@ public static class TestDataFactory
             UnitPrice = 5.5m * _idCounter,
             Status = TestStatus.Pending,
             Tag = sharedTag,
-            Assignee = sharedUser,
+            Assignee = assignee,
             ItemMetadata = sharedMetadata
         };
 
         for (int i = 0; i < palletCount; i++)
         {
-            var pallet = CreatePallet(measurementsPerPallet, pointsPerMeasurement, sharedMetadata);
+            // Pass shared references to all levels - creates many shared refs!
+            var pallet = CreatePallet(
+                measurementsPerPallet, 
+                pointsPerMeasurement, 
+                sharedMetadata,
+                sharedTag,        // IId shared ref
+                sharedUser,       // IId shared ref
+                sharedCategory);  // IId shared ref
             pallet.ParentItem = item;
             item.Pallets.Add(pallet);
         }
@@ -177,13 +211,19 @@ public static class TestDataFactory
         return item;
     }
 
+
+
+
     /// <summary>
     /// Create a pallet with measurements
     /// </summary>
     public static TestPallet CreatePallet(
         int measurementCount = 2,
         int pointsPerMeasurement = 3,
-        MetadataInfo? sharedMetadata = null)
+        MetadataInfo? sharedMetadata = null,
+        SharedTag? sharedTag = null,
+        SharedUser? sharedInspector = null,
+        SharedCategory? sharedCategory = null)
     {
         var pallet = new TestPallet
         {
@@ -192,12 +232,15 @@ public static class TestDataFactory
             TrayCount = 5 + _idCounter % 10,
             Status = TestStatus.Pending,
             Weight = 100.5 + _idCounter,
-            PalletMetadata = sharedMetadata
+            PalletMetadata = sharedMetadata,
+            Tag = sharedTag,
+            Inspector = sharedInspector,
+            Category = sharedCategory
         };
 
         for (int i = 0; i < measurementCount; i++)
         {
-            var measurement = CreateMeasurement(pointsPerMeasurement);
+            var measurement = CreateMeasurement(pointsPerMeasurement, sharedTag, sharedInspector);
             measurement.ParentPallet = pallet;
             pallet.Measurements.Add(measurement);
         }
@@ -208,19 +251,24 @@ public static class TestDataFactory
     /// <summary>
     /// Create a measurement with points
     /// </summary>
-    public static TestMeasurement CreateMeasurement(int pointCount = 3)
+    public static TestMeasurement CreateMeasurement(
+        int pointCount = 3,
+        SharedTag? sharedTag = null,
+        SharedUser? sharedOperator = null)
     {
         var measurement = new TestMeasurement
         {
             Id = _idCounter++,
             Name = $"Measurement-{_idCounter}",
             TotalWeight = 100.5 + _idCounter,
-            CreatedAt = DateTime.UtcNow
+            CreatedAt = DateTime.UtcNow,
+            Tag = sharedTag,
+            Operator = sharedOperator
         };
 
         for (int i = 0; i < pointCount; i++)
         {
-            var point = CreateMeasurementPoint();
+            var point = CreateMeasurementPoint(sharedTag, sharedOperator);
             point.ParentMeasurement = measurement;
             measurement.Points.Add(point);
         }
@@ -231,7 +279,9 @@ public static class TestDataFactory
     /// <summary>
     /// Create a measurement point
     /// </summary>
-    public static TestMeasurementPoint CreateMeasurementPoint()
+    public static TestMeasurementPoint CreateMeasurementPoint(
+        SharedTag? sharedTag = null,
+        SharedUser? sharedVerifier = null)
     {
         var id = _idCounter++;
         return new TestMeasurementPoint
@@ -239,7 +289,9 @@ public static class TestDataFactory
             Id = id,
             Label = $"Point-{id}",
             Value = 10.5 + (id * 0.1),
-            MeasuredAt = DateTime.UtcNow
+            MeasuredAt = DateTime.UtcNow,
+            Tag = sharedTag,
+            Verifier = sharedVerifier
         };
     }
 

AyCode.Core/Serializers/Binaries/AcBinaryDeserializer.cs

@@ -934,9 +934,9 @@ public static partial class AcBinaryDeserializer
         }
         else
         {
-            // Non-IId: [ObjectRef][hashcode] - lookup by hashcode
+            // Non-IId: [ObjectRef][hashcode] - lookup by hashcode (always Int32)
             var hashcode = context.ReadVarInt();
-            if (context.ContextClass.TryGetValue(wrapper, hashcode, out var instance))
+            if (wrapper.TryGetValueInt32(hashcode, out var instance))
                 return instance;
             
             throw new AcBinaryDeserializationException(
@@ -949,7 +949,7 @@ public static partial class AcBinaryDeserializer
     private static object? ReadObjectRefInt32(ref BinaryDeserializationContext context, ref TypeMetadataWrapper<BinaryDeserializeTypeMetadata> wrapper)
     {
         var id = context.ReadVarInt();
-        if (context.ContextClass.TryGetValue(wrapper, id, out var instance))
+        if (wrapper.TryGetValueInt32(id, out var instance))
             return instance;
         
         throw new AcBinaryDeserializationException(
@@ -961,7 +961,7 @@ public static partial class AcBinaryDeserializer
     private static object? ReadObjectRefInt64(ref BinaryDeserializationContext context, ref TypeMetadataWrapper<BinaryDeserializeTypeMetadata> wrapper)
     {
         var id = context.ReadVarLong();
-        if (context.ContextClass.TryGetValue(wrapper, id, out var instance))
+        if (wrapper.TryGetValueInt64(id, out var instance))
             return instance;
         
         throw new AcBinaryDeserializationException(
@@ -973,7 +973,7 @@ public static partial class AcBinaryDeserializer
     private static object? ReadObjectRefGuid(ref BinaryDeserializationContext context, ref TypeMetadataWrapper<BinaryDeserializeTypeMetadata> wrapper)
     {
         var id = context.ReadGuidUnsafe();
-        if (context.ContextClass.TryGetValue(wrapper, id, out var instance))
+        if (wrapper.TryGetValueGuid(id, out var instance))
             return instance;
         
         throw new AcBinaryDeserializationException(
@@ -1012,22 +1012,8 @@ public static partial class AcBinaryDeserializer
                 
                 PopulateObject(ref context, instance, metadata, depth, skipDefaultWrite: true);
                 
-                // Register by Id after populate (Id is now set)
-                switch (metadata.IdAccessorType)
-                {
-                    case AcSerializerCommon.IdAccessorType.Int32:
-                        var intId = metadata.GetIdInt32(instance);
-                        context.ContextClass.TryGetOrStoreInt32(wrapper, instance, intId);
-                        break;
-                    case AcSerializerCommon.IdAccessorType.Int64:
-                        var longId = metadata.GetIdInt64(instance);
-                        context.ContextClass.TryGetOrStoreLong(wrapper, instance, longId);
-                        break;
-                    case AcSerializerCommon.IdAccessorType.Guid:
-                        var guidId = metadata.GetIdGuid(instance);
-                        context.ContextClass.TryGetOrStoreGuid(wrapper, instance, guidId);
-                        break;
-                }
+                // Register by Id after populate - uses typed methods on wrapper
+                RegisterIIdInstance(context.ContextClass, wrapper, instance, metadata);
             }
             else
             {
@@ -1035,13 +1021,13 @@ public static partial class AcBinaryDeserializer
                 var hashcode = context.ReadVarInt();
                 
                 // TryGetValue - if already exists, return (shouldn't happen for Object, only ObjectRef)
-                if (context.ContextClass.TryGetValue(wrapper, hashcode, out instance))
+                if (wrapper.TryGetValueInt32(hashcode, out instance))
                     return instance;
                 
-                // Create + Register by hashcode
+                // Create + Register by hashcode (always Int32 for Non-IId)
                 instance = CreateInstance(targetType, metadata);
                 if (instance == null) return null;
-                context.ContextClass.TryGetOrStoreInt32(wrapper, instance, hashcode);
+                wrapper.TryGetOrStoreInt32(hashcode, instance);
                 
                 // Populate
                 PopulateObject(ref context, instance, metadata, depth, skipDefaultWrite: true);
@@ -1060,23 +1046,7 @@ public static partial class AcBinaryDeserializer
         // Note: For ChainMode, we need IdGetter OR typed getters (IdAccessorType != None)
         if (context.IsChainMode && metadata.IsIId && metadata.IdType != null)
         {
-            object? id;
-            switch (metadata.IdAccessorType)
-            {
-                case AcSerializerCommon.IdAccessorType.Int32:
-                    id = metadata.GetIdInt32(instance);
-                    break;
-                case AcSerializerCommon.IdAccessorType.Int64:
-                    id = metadata.GetIdInt64(instance);
-                    break;
-                case AcSerializerCommon.IdAccessorType.Guid:
-                    id = metadata.GetIdGuid(instance);
-                    break;
-                default:
-                    id = null;
-                    break;
-            }
-
+            var id = GetIdBoxed(instance, metadata);
             if (id != null && !IsDefaultValue(id, metadata.IdType))
             {
                 // Check if we already have this object
@@ -1491,6 +1461,39 @@ public static partial class AcBinaryDeserializer
 
     #endregion
 
+    #region IId Registration Helpers
+    
+    /// <summary>
+    /// Registers an IId instance after populate - uses pre-bound delegate, NO SWITCH!
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private static void RegisterIIdInstance(
+        BinaryDeserializationContextClass contextClass,
+        TypeMetadataWrapper<BinaryDeserializeTypeMetadata> wrapper,
+        object instance,
+        BinaryDeserializeTypeMetadata metadata)
+    {
+        // Pre-bound delegate - no switch needed!
+        wrapper.RegisterById!(instance);
+    }
+    
+    /// <summary>
+    /// Gets Id as boxed object - only used for ChainMode (rare path).
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private static object? GetIdBoxed(object instance, BinaryDeserializeTypeMetadata metadata)
+    {
+        return metadata.IdAccessorType switch
+        {
+            AcSerializerCommon.IdAccessorType.Int32 => metadata.GetIdInt32(instance),
+            AcSerializerCommon.IdAccessorType.Int64 => metadata.GetIdInt64(instance),
+            AcSerializerCommon.IdAccessorType.Guid => metadata.GetIdGuid(instance),
+            _ => null
+        };
+    }
+
+    #endregion
+
     #region Type Metadata
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]

AyCode.Core/Serializers/SerializationContextBase.cs

@@ -40,8 +40,8 @@ public abstract class SerializationContextBase<TMetadata, TOptions> : AcSerializ
     {
         Debug.Assert(wrapper.Metadata.IdAccessorType == AcSerializerCommon.IdAccessorType.Int32);
 
-        var getter = (Func<object, int>)wrapper.RefIdGetter;
-        refId = getter(obj);
+        // Use pre-cast getter - no cast overhead!
+        refId = wrapper.RefIdGetterInt32!(obj);
 
         // BitArray fast path for small positive IDs
         return refId is >= 0 and < MaxSmallId ? TryTrackSmallId(wrapper, refId) : wrapper.TryAddKey(refId);
@@ -50,8 +50,8 @@ public abstract class SerializationContextBase<TMetadata, TOptions> : AcSerializ
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static bool TryTrackSmallId(TypeMetadataWrapper<TMetadata> wrapper, int id)
     {
-        wrapper.EnsureSmallIdBitmap();
-        var bitmap = wrapper.SmallIdBitmap!;
+        // Lazy init - but only once per type per serialization
+        var bitmap = wrapper.SmallIdBitmap ?? InitSmallIdBitmap(wrapper);
 
         var idx = (uint)id;
         var wordIdx = idx >> 6;
@@ -66,6 +66,13 @@ public abstract class SerializationContextBase<TMetadata, TOptions> : AcSerializ
         return true;
     }
     
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    private static ulong[] InitSmallIdBitmap(TypeMetadataWrapper<TMetadata> wrapper)
+    {
+        wrapper.SmallIdBitmap = new ulong[BitArraySize];
+        return wrapper.SmallIdBitmap;
+    }
+
     /// <summary>
     /// Tries to track an object with long RefId.
     /// Use when wrapper.Metadata.IdAccessorType == Int64.
@@ -76,8 +83,8 @@ public abstract class SerializationContextBase<TMetadata, TOptions> : AcSerializ
     {
         Debug.Assert(wrapper.Metadata.IdAccessorType == AcSerializerCommon.IdAccessorType.Int64);
 
-        var getter = (Func<object, long>)wrapper.RefIdGetter;
-        refId = getter(obj);
+        // Use pre-cast getter - no cast overhead!
+        refId = wrapper.RefIdGetterInt64!(obj);
 
         return wrapper.TryAddKey(refId);
     }
@@ -92,8 +99,8 @@ public abstract class SerializationContextBase<TMetadata, TOptions> : AcSerializ
     {
         Debug.Assert(wrapper.Metadata.IdAccessorType == AcSerializerCommon.IdAccessorType.Guid);
 
-        var getter = (Func<object, Guid>)wrapper.RefIdGetter;
-        refId = getter(obj);
+        // Use pre-cast getter - no cast overhead!
+        refId = wrapper.RefIdGetterGuid!(obj);
 
         return wrapper.TryAddKey(refId);
     }

AyCode.Core/Serializers/TypeMetadataWrapper.cs

@@ -8,7 +8,7 @@ namespace AyCode.Core.Serializers;
 /// <summary>
 /// Wrapper that combines metadata with tracking state.
 /// Each context has one wrapper per type - contains all type-specific info and state.
-/// Not generic on TRefId - uses runtime typed Delegate and object for flexibility.
+/// Uses typed fields instead of generics for zero-overhead Id operations.
 /// </summary>
 /// <typeparam name="TMetadata">The concrete metadata type (BinarySerializeTypeMetadata, etc.)</typeparam>
 public sealed class TypeMetadataWrapper<TMetadata> where TMetadata : TypeMetadataBase
@@ -19,20 +19,45 @@ public sealed class TypeMetadataWrapper<TMetadata> where TMetadata : TypeMetadat
     public readonly TMetadata Metadata;
     
     /// <summary>
-    /// Typed getter for reference ID. Runtime type is Func&lt;object, int/long/Guid&gt;.
-    /// Use IdAccessorType to determine the actual type.
-    /// For IId types: uses metadata.TypedIdGetter (cached in metadata).
-    /// For non-IId types: uses RuntimeHelpers.GetHashCode.
+    /// Pre-cast Int32 getter for fast path (no cast needed in TryTrack).
+    /// Set when IdAccessorType == Int32.
     /// </summary>
-    internal readonly Delegate RefIdGetter;
+    internal readonly Func<object, int>? RefIdGetterInt32;
     
     /// <summary>
-    /// Identity map for tracking. Runtime type is IdentityMap&lt;int/long/Guid&gt;.
+    /// Pre-cast Int64 getter for fast path.
+    /// Set when IdAccessorType == Int64.
     /// </summary>
-    protected AcSerializerCommon.IIdentityMap? IdentityMap;
+    internal readonly Func<object, long>? RefIdGetterInt64;
     
     /// <summary>
-    /// BitArray for tracking small int32 IDs (0-65535).
+    /// Pre-cast Guid getter for fast path.
+    /// Set when IdAccessorType == Guid.
+    /// </summary>
+    internal readonly Func<object, Guid>? RefIdGetterGuid;
+
+    #region Typed IdentityMaps - No generic type checks in hot path!
+    
+    /// <summary>
+    /// Typed IdentityMap for Int32 IDs. Direct access, no type check.
+    /// </summary>
+    internal AcSerializerCommon.IdentityMap<int>? IdentityMapInt32;
+    
+    /// <summary>
+    /// Typed IdentityMap for Int64 IDs. Direct access, no type check.
+    /// </summary>
+    internal AcSerializerCommon.IdentityMap<long>? IdentityMapInt64;
+    
+    /// <summary>
+    /// Typed IdentityMap for Guid IDs. Direct access, no type check.
+    /// </summary>
+    internal AcSerializerCommon.IdentityMap<Guid>? IdentityMapGuid;
+    
+    
+    #endregion
+
+    /// <summary>
+    /// BitArray for tracking small int32 IDs (0-65535) during serialization.
     /// Only used when IdAccessorType == Int32.
     /// </summary>
     internal ulong[]? SmallIdBitmap;
@@ -45,16 +70,40 @@ public sealed class TypeMetadataWrapper<TMetadata> where TMetadata : TypeMetadat
     /// </summary>
     private static readonly Func<object, int> HashCodeGetter = RuntimeHelpers.GetHashCode;
     
+    /// <summary>
+    /// Pre-bound delegate to register instance by Id - NO SWITCH in hot path!
+    /// Set in constructor based on IdAccessorType. Method group conversion = no allocation.
+    /// </summary>
+    internal readonly Action<object>? RegisterById;
+
     /// <summary>
     /// Creates a new wrapper for the given metadata.
     /// Uses metadata.TypedIdGetter for IId types (cached, no allocation).
+    /// Pre-casts typed getters for zero-overhead access in hot path.
     /// </summary>
     public TypeMetadataWrapper(TMetadata metadata)
     {
         Metadata = metadata;
 
         // Use cached delegate from metadata for IId types, static fallback for non-IId
-        RefIdGetter = metadata.TypedIdGetter ?? HashCodeGetter;
+        var refIdGetter = metadata.TypedIdGetter ?? HashCodeGetter;
+        
+        // Pre-cast typed getters AND set RegisterById delegate - avoids switch in every call
+        switch (metadata.IdAccessorType)
+        {
+            case AcSerializerCommon.IdAccessorType.Int32:
+                RefIdGetterInt32 = (Func<object, int>)refIdGetter;
+                RegisterById = RegisterByInt32Id;  // Method group - no allocation!
+                break;
+            case AcSerializerCommon.IdAccessorType.Int64:
+                RefIdGetterInt64 = (Func<object, long>)refIdGetter;
+                RegisterById = RegisterByInt64Id;
+                break;
+            case AcSerializerCommon.IdAccessorType.Guid:
+                RefIdGetterGuid = (Func<object, Guid>)refIdGetter;
+                RegisterById = RegisterByGuidId;
+                break;
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -65,7 +114,7 @@ public sealed class TypeMetadataWrapper<TMetadata> where TMetadata : TypeMetadat
 
     /// <summary>
     /// Resets tracking state for reuse between serializations.
-    /// Does not deallocate - just clears for reuse.
+    /// Does not deallocate - just clears for reuse (pool-friendly).
     /// </summary>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public void ResetTracking()
@@ -73,31 +122,149 @@ public sealed class TypeMetadataWrapper<TMetadata> where TMetadata : TypeMetadat
         if (SmallIdBitmap != null)
             Array.Clear(SmallIdBitmap);
 
-        IdentityMap?.Reset();
+        IdentityMapInt32?.Reset();
+        IdentityMapInt64?.Reset();
+        IdentityMapGuid?.Reset();
+    }
+
+    #region Direct Int32 Operations - No type check, no generic overhead
+    
+    /// <summary>
+    /// Tries to get object by Int32 Id. Returns true if found.
+    /// Direct dictionary lookup - no generic type check!
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryGetValueInt32(int id, out object? instance)
+    {
+        if (IdentityMapInt32 != null)
+            return IdentityMapInt32.TryGetValue(id, out instance);
+        
+        instance = null;
+        return false;
     }
     
     /// <summary>
-    /// Ensures SmallIdBitmap is allocated (lazy allocation).
+    /// Gets existing object or stores new one by Int32 Id.
+    /// Direct dictionary access - no generic type check!
     /// </summary>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal void EnsureSmallIdBitmap()
+    public object TryGetOrStoreInt32(int id, object newObj)
     {
-        SmallIdBitmap ??= new ulong[BitArraySize];
+        if (id == 0) return newObj; // Default Id - no tracking
+        
+        var map = IdentityMapInt32 ??= new AcSerializerCommon.IdentityMap<int>();
+        return map.TryGetOrAddValue(id, newObj);
     }
     
+    /// <summary>
+    /// Registers IId instance by extracting its Int32 Id.
+    /// Combines Id getter + store in one call.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void RegisterByInt32Id(object instance)
+    {
+        var id = RefIdGetterInt32!(instance);
+        if (id == 0) return;
+        
+        var map = IdentityMapInt32 ??= new AcSerializerCommon.IdentityMap<int>();
+        map.TryGetOrAddValue(id, instance);
+    }
+    
+    #endregion
+
+    #region Direct Int64 Operations
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryGetValueInt64(long id, out object? instance)
+    {
+        if (IdentityMapInt64 != null)
+            return IdentityMapInt64.TryGetValue(id, out instance);
+        
+        instance = null;
+        return false;
+    }
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public object TryGetOrStoreInt64(long id, object newObj)
+    {
+        if (id == 0) return newObj;
+        
+        var map = IdentityMapInt64 ??= new AcSerializerCommon.IdentityMap<long>();
+        return map.TryGetOrAddValue(id, newObj);
+    }
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void RegisterByInt64Id(object instance)
+    {
+        var id = RefIdGetterInt64!(instance);
+        if (id == 0) return;
+        
+        var map = IdentityMapInt64 ??= new AcSerializerCommon.IdentityMap<long>();
+        map.TryGetOrAddValue(id, instance);
+    }
+    
+    #endregion
+
+    #region Direct Guid Operations
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryGetValueGuid(Guid id, out object? instance)
+    {
+        if (IdentityMapGuid != null)
+            return IdentityMapGuid.TryGetValue(id, out instance);
+        
+        instance = null;
+        return false;
+    }
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public object TryGetOrStoreGuid(Guid id, object newObj)
+    {
+        if (id == Guid.Empty) return newObj;
+        
+        var map = IdentityMapGuid ??= new AcSerializerCommon.IdentityMap<Guid>();
+        return map.TryGetOrAddValue(id, newObj);
+    }
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void RegisterByGuidId(object instance)
+    {
+        var id = RefIdGetterGuid!(instance);
+        if (id == Guid.Empty) return;
+        
+        var map = IdentityMapGuid ??= new AcSerializerCommon.IdentityMap<Guid>();
+        map.TryGetOrAddValue(id, instance);
+    }
+    
+    #endregion
+
+    #region Legacy Generic Methods (for backward compatibility)
+    
     /// <summary>
     /// Gets or creates the typed IdentityMap for tracking.
-    /// Use: wrapper.GetOrCreateIdentityMap&lt;int&gt;().TryAddKey(id)
+    /// SLOW PATH - use typed methods (TryGetValueInt32, etc.) instead!
     /// </summary>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public AcSerializerCommon.IdentityMap<TId> GetOrCreateIdentityMap<TId>() where TId : notnull
     {
-        if (IdentityMap is AcSerializerCommon.IdentityMap<TId> typedMap)
-            return typedMap;
+        // Route to typed fields based on TId
+        if (typeof(TId) == typeof(int))
+        {
+            var map = IdentityMapInt32 ??= new AcSerializerCommon.IdentityMap<int>();
+            return Unsafe.As<AcSerializerCommon.IdentityMap<int>, AcSerializerCommon.IdentityMap<TId>>(ref map);
+        }
+        if (typeof(TId) == typeof(long))
+        {
+            var map = IdentityMapInt64 ??= new AcSerializerCommon.IdentityMap<long>();
+            return Unsafe.As<AcSerializerCommon.IdentityMap<long>, AcSerializerCommon.IdentityMap<TId>>(ref map);
+        }
+        if (typeof(TId) == typeof(Guid))
+        {
+            var map = IdentityMapGuid ??= new AcSerializerCommon.IdentityMap<Guid>();
+            return Unsafe.As<AcSerializerCommon.IdentityMap<Guid>, AcSerializerCommon.IdentityMap<TId>>(ref map);
+        }
         
-        var newMap = new AcSerializerCommon.IdentityMap<TId>();
-        IdentityMap = newMap;
-        return newMap;
+        throw new NotSupportedException($"Id type {typeof(TId)} is not supported");
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -117,9 +284,9 @@ public sealed class TypeMetadataWrapper<TMetadata> where TMetadata : TypeMetadat
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public object TryGetOrStoreId<TId>(TId id, object newObj) where TId : struct
     {
-        //if (id == default(TId)) return newObj; // Default Id - no tracking
-
         var map = GetOrCreateIdentityMap<TId>();
         return map.TryGetOrAddValue(id, newObj);
     }
+    
+    #endregion
 }