diff --git a/AyCode.Core/Serializers/AcSerializerCommon.cs b/AyCode.Core/Serializers/AcSerializerCommon.cs
index 7bfd6ca..2720a24 100644
--- a/AyCode.Core/Serializers/AcSerializerCommon.cs
+++ b/AyCode.Core/Serializers/AcSerializerCommon.cs
@@ -681,8 +681,8 @@ public static class AcSerializerCommon
     /// </summary>
     public sealed class SerializationReferenceTracker
     {
-        private const int InitialReferenceCapacity = 16;
-        private const int InitialMultiRefCapacity = 8;
+        private const int InitialReferenceCapacity = 64;
+        private const int InitialMultiRefCapacity = 32;
         
         private Dictionary<object, int>? _scanOccurrences;
         private Dictionary<object, int>? _writtenRefs;
@@ -982,7 +982,7 @@ public static class AcSerializerCommon
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void RegisterObject(int id, object obj)
         {
-            _idToObject ??= new Dictionary<int, object>(8);
+            _idToObject ??= new Dictionary<int, object>(64);
             _idToObject[id] = obj;
         }
 
diff --git a/AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs b/AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs
index 27ac81c..a0aa98f 100644
--- a/AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs
+++ b/AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs
@@ -228,10 +228,9 @@ public static partial class AcBinarySerializer
         var metadata = GetTypeMetadata(type);
         var properties = metadata.Properties;
         
-        // Use Span-based iteration to avoid struct copying
         for (var i = 0; i < properties.Length; i++)
         {
-            ref readonly var prop = ref properties[i];
+            var prop = properties[i];
             
             if (!context.ShouldSerializeProperty(value, prop))
             {
diff --git a/AyCode.Core/Serializers/Jsons/AcJsonDeserializer.JsonElement.cs b/AyCode.Core/Serializers/Jsons/AcJsonDeserializer.JsonElement.cs
index 3522569..706fe3c 100644
--- a/AyCode.Core/Serializers/Jsons/AcJsonDeserializer.JsonElement.cs
+++ b/AyCode.Core/Serializers/Jsons/AcJsonDeserializer.JsonElement.cs
@@ -112,8 +112,10 @@ public static partial class AcJsonDeserializer
     /// </summary>
     private static void CopyPropertiesJson(object source, object target, JsonDeserializeTypeMetadata metadata)
     {
-        foreach (var prop in metadata.PropertiesArray)
+        var props = metadata.PropertiesArray;
+        for (var i = 0; i < props.Length; i++)
         {
+            var prop = props[i];
             var value = prop.GetValue(source);
             if (value != null)
                 prop.SetValue(target, value);
diff --git a/AyCode.Core/Serializers/ReferenceTracker.cs b/AyCode.Core/Serializers/ReferenceTracker.cs
index dd9fe1f..6ebb2fa 100644
--- a/AyCode.Core/Serializers/ReferenceTracker.cs
+++ b/AyCode.Core/Serializers/ReferenceTracker.cs
@@ -98,7 +98,7 @@ public sealed class DeserializationReferenceTracker
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public void RegisterObject(string id, object obj)
     {
-        _idToObject ??= new Dictionary<string, object>(8, StringComparer.Ordinal);
+        _idToObject ??= new Dictionary<string, object>(64, StringComparer.Ordinal);
         _idToObject[id] = obj;
     }