diff --git a/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/AuditingContractResolver.cs b/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/AuditingContractResolver.cs
index 24f86ce0b4..e6d03bf707 100644
--- a/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/AuditingContractResolver.cs
+++ b/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/AuditingContractResolver.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Reflection;
 using Newtonsoft.Json;
diff --git a/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/JsonNetAuditSerializer.cs b/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/JsonNetAuditSerializer.cs
index 3862dd01da..b86df6b6c8 100644
--- a/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/JsonNetAuditSerializer.cs
+++ b/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/JsonNetAuditSerializer.cs
@@ -16,12 +16,29 @@ namespace Volo.Abp.Auditing
 
         public string Serialize(object obj)
         {
-            var options = new JsonSerializerSettings
+            return JsonConvert.SerializeObject(obj, GetSharedJsonSerializerSettings());
+        }
+
+        private static readonly object SyncObj = new object();
+        private static JsonSerializerSettings _sharedJsonSerializerSettings;
+
+        private JsonSerializerSettings GetSharedJsonSerializerSettings()
+        {
+            if (_sharedJsonSerializerSettings == null)
             {
-                ContractResolver = new AuditingContractResolver(Options.IgnoredTypes)
-            };
+                lock (SyncObj)
+                {
+                    if (_sharedJsonSerializerSettings == null)
+                    {
+                        _sharedJsonSerializerSettings = new JsonSerializerSettings
+                        {
+                            ContractResolver = new AuditingContractResolver(Options.IgnoredTypes)
+                        };
+                    }
+                }
+            }
 
-            return JsonConvert.SerializeObject(obj, options);
+            return _sharedJsonSerializerSettings;
         }
     }
 }
\ No newline at end of file
diff --git a/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/ApiDescriptionFinder.cs b/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/ApiDescriptionFinder.cs
index 4114b89892..882bf94cb0 100644
--- a/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/ApiDescriptionFinder.cs
+++ b/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/ApiDescriptionFinder.cs
@@ -18,6 +18,11 @@ namespace Volo.Abp.Http.Client.DynamicProxying
 
         protected IApiDescriptionCache Cache { get; }
 
+        private static readonly JsonSerializerSettings SharedJsonSerializerSettings = new JsonSerializerSettings
+        {
+            ContractResolver = new CamelCasePropertyNamesContractResolver()
+        };
+
         public ApiDescriptionFinder(
             IApiDescriptionCache cache, 
             IDynamicProxyHttpClientFactory httpClientFactory)
@@ -94,11 +99,7 @@ namespace Volo.Abp.Http.Client.DynamicProxying
 
                 var result = JsonConvert.DeserializeObject(
                     content,
-                    typeof(ApplicationApiDescriptionModel),
-                    new JsonSerializerSettings
-                    {
-                        ContractResolver = new CamelCasePropertyNamesContractResolver()
-                    });
+                    typeof(ApplicationApiDescriptionModel), SharedJsonSerializerSettings);
 
                 return (ApplicationApiDescriptionModel)result;
             }
diff --git a/framework/src/Volo.Abp.Json/Volo/Abp/Json/Newtonsoft/NewtonsoftJsonSerializer.cs b/framework/src/Volo.Abp.Json/Volo/Abp/Json/Newtonsoft/NewtonsoftJsonSerializer.cs
index 262c2b04d7..99252b8448 100644
--- a/framework/src/Volo.Abp.Json/Volo/Abp/Json/Newtonsoft/NewtonsoftJsonSerializer.cs
+++ b/framework/src/Volo.Abp.Json/Volo/Abp/Json/Newtonsoft/NewtonsoftJsonSerializer.cs
@@ -9,6 +9,9 @@ namespace Volo.Abp.Json.Newtonsoft
     {
         private readonly AbpJsonIsoDateTimeConverter _dateTimeConverter;
 
+        private static readonly CamelCaseExceptDictionaryKeysResolver SharedCamelCaseExceptDictionaryKeysResolver =
+            new CamelCaseExceptDictionaryKeysResolver();
+
         public NewtonsoftJsonSerializer(AbpJsonIsoDateTimeConverter dateTimeConverter)
         {
             _dateTimeConverter = dateTimeConverter;
@@ -37,7 +40,7 @@ namespace Volo.Abp.Json.Newtonsoft
             
             if (camelCase)
             {
-                settings.ContractResolver = new CamelCaseExceptDictionaryKeysResolver();
+                settings.ContractResolver = SharedCamelCaseExceptDictionaryKeysResolver;
             }
 
             if (indented)
diff --git a/framework/src/Volo.Abp.Localization/Volo/Abp/Localization/Json/JsonLocalizationDictionaryBuilder.cs b/framework/src/Volo.Abp.Localization/Volo/Abp/Localization/Json/JsonLocalizationDictionaryBuilder.cs
index 325d67800d..9b1f1617f6 100644
--- a/framework/src/Volo.Abp.Localization/Volo/Abp/Localization/Json/JsonLocalizationDictionaryBuilder.cs
+++ b/framework/src/Volo.Abp.Localization/Volo/Abp/Localization/Json/JsonLocalizationDictionaryBuilder.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using Microsoft.Extensions.Localization;
@@ -9,6 +9,11 @@ namespace Volo.Abp.Localization.Json
 {
     public static class JsonLocalizationDictionaryBuilder
     {
+        private static readonly JsonSerializerSettings SharedJsonSerializerSettings = new JsonSerializerSettings
+        {
+            ContractResolver = new CamelCasePropertyNamesContractResolver()
+        };
+
         /// <summary>
         ///     Builds an <see cref="JsonLocalizationDictionaryBuilder" /> from given file.
         /// </summary>
@@ -35,11 +40,7 @@ namespace Volo.Abp.Localization.Json
             try
             {
                 jsonFile = JsonConvert.DeserializeObject<JsonLocalizationFile>(
-                    jsonString,
-                    new JsonSerializerSettings
-                    {
-                        ContractResolver = new CamelCasePropertyNamesContractResolver()
-                    });
+                    jsonString, SharedJsonSerializerSettings);
             }
             catch (JsonException ex)
             {
diff --git a/framework/test/Volo.Abp.AspNetCore.Tests/Volo/Abp/AspNetCore/AbpAspNetCoreTestBase.cs b/framework/test/Volo.Abp.AspNetCore.Tests/Volo/Abp/AspNetCore/AbpAspNetCoreTestBase.cs
index 6bb82c3656..33beb9d62c 100644
--- a/framework/test/Volo.Abp.AspNetCore.Tests/Volo/Abp/AspNetCore/AbpAspNetCoreTestBase.cs
+++ b/framework/test/Volo.Abp.AspNetCore.Tests/Volo/Abp/AspNetCore/AbpAspNetCoreTestBase.cs
@@ -11,13 +11,16 @@ namespace Volo.Abp.AspNetCore
     public abstract class AbpAspNetCoreTestBase<TStartup> : AbpAspNetCoreIntegratedTestBase<TStartup>
         where TStartup : class
     {
+        private static readonly JsonSerializerSettings SharedJsonSerializerSettings =
+            new JsonSerializerSettings
+            {
+                ContractResolver = new CamelCasePropertyNamesContractResolver()
+            };
+
         protected virtual async Task<T> GetResponseAsObjectAsync<T>(string url, HttpStatusCode expectedStatusCode = HttpStatusCode.OK)
         {
             var strResponse = await GetResponseAsStringAsync(url, expectedStatusCode);
-            return JsonConvert.DeserializeObject<T>(strResponse, new JsonSerializerSettings
-            {
-                ContractResolver = new CamelCasePropertyNamesContractResolver()
-            });
+            return JsonConvert.DeserializeObject<T>(strResponse, SharedJsonSerializerSettings);
         }
 
         protected virtual async Task<string> GetResponseAsStringAsync(string url, HttpStatusCode expectedStatusCode = HttpStatusCode.OK)