diff --git a/Src/Newtonsoft.Json/Linq/JToken.cs b/Src/Newtonsoft.Json/Linq/JToken.cs
index 05dfa752..4ba4defd 100644
--- a/Src/Newtonsoft.Json/Linq/JToken.cs
+++ b/Src/Newtonsoft.Json/Linq/JToken.cs
@@ -214,7 +214,11 @@ namespace Newtonsoft.Json.Linq
                     previous = current;
                 }
 
+#if HAVE_FAST_REVERSE
+                positions.FastReverse();
+#else
                 positions.Reverse();
+#endif
 
                 return JsonPosition.BuildPath(positions, null);
             }
@@ -478,7 +482,7 @@ namespace Newtonsoft.Json.Linq
             return (Array.IndexOf(validTypes, o.Type) != -1) || (nullable && (o.Type == JTokenType.Null || o.Type == JTokenType.Undefined));
         }
 
-        #region Cast from operators
+#region Cast from operators
         /// <summary>
         /// Performs an explicit conversion from <see cref="Newtonsoft.Json.Linq.JToken"/> to <see cref="System.Boolean"/>.
         /// </summary>
@@ -1495,9 +1499,9 @@ namespace Newtonsoft.Json.Linq
             return ConvertUtils.ToBigInteger(v.Value);
         }
 #endif
-        #endregion
+#endregion
 
-        #region Cast to operators
+#region Cast to operators
         /// <summary>
         /// Performs an implicit conversion from <see cref="Boolean"/> to <see cref="JToken"/>.
         /// </summary>
@@ -1861,7 +1865,7 @@ namespace Newtonsoft.Json.Linq
         {
             return new JValue(value);
         }
-        #endregion
+#endregion
 
         IEnumerator IEnumerable.GetEnumerator()
         {
diff --git a/Src/Newtonsoft.Json/Newtonsoft.Json.csproj b/Src/Newtonsoft.Json/Newtonsoft.Json.csproj
index 8dd1137d..ac519025 100644
--- a/Src/Newtonsoft.Json/Newtonsoft.Json.csproj
+++ b/Src/Newtonsoft.Json/Newtonsoft.Json.csproj
@@ -34,19 +34,19 @@
   </ItemGroup>
   <PropertyGroup Condition="'$(TargetFramework)'=='net45'">
     <AssemblyTitle>Json.NET</AssemblyTitle>
-    <DefineConstants>HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_ASYNC;HAVE_BIG_INTEGER;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_CONCURRENT_COLLECTIONS;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_DYNAMIC;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_EXPRESSIONS;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_METHOD_IMPL_ATTRIBUTE;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_READ_ONLY_COLLECTIONS;HAVE_REFLECTION_EMIT;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;HAVE_CONCURRENT_DICTIONARY;$(AdditionalConstants)</DefineConstants>
+    <DefineConstants>HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_ASYNC;HAVE_BIG_INTEGER;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_CONCURRENT_COLLECTIONS;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_DYNAMIC;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_EXPRESSIONS;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_METHOD_IMPL_ATTRIBUTE;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_READ_ONLY_COLLECTIONS;HAVE_REFLECTION_EMIT;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;HAVE_CONCURRENT_DICTIONARY;$(AdditionalConstants)</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetFramework)'=='net40'">
     <AssemblyTitle>Json.NET .NET 4.0</AssemblyTitle>
-    <DefineConstants>NET40;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_BIG_INTEGER;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_CONCURRENT_COLLECTIONS;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_DYNAMIC;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_EXPRESSIONS;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_REFLECTION_EMIT;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;HAVE_CONCURRENT_DICTIONARY;$(AdditionalConstants)</DefineConstants>
+    <DefineConstants>NET40;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_BIG_INTEGER;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_CONCURRENT_COLLECTIONS;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_DYNAMIC;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_EXPRESSIONS;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_REFLECTION_EMIT;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;HAVE_CONCURRENT_DICTIONARY;$(AdditionalConstants)</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetFramework)'=='net35'">
     <AssemblyTitle>Json.NET .NET 3.5</AssemblyTitle>
-    <DefineConstants>NET35;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_FULL_REFLECTION;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_REFLECTION_EMIT;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;$(AdditionalConstants)</DefineConstants>
+    <DefineConstants>NET35;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_FAST_REVERSE;HAVE_FULL_REFLECTION;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_REFLECTION_EMIT;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;$(AdditionalConstants)</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetFramework)'=='net20'">
     <AssemblyTitle>Json.NET .NET 2.0</AssemblyTitle>
-    <DefineConstants>NET20;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_DB_NULL_TYPE_CODE;HAVE_EMPTY_TYPES;HAVE_FULL_REFLECTION;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_MEMORY_BARRIER;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_REFLECTION_EMIT;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;$(AdditionalConstants)</DefineConstants>
+    <DefineConstants>NET20;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_DB_NULL_TYPE_CODE;HAVE_EMPTY_TYPES;HAVE_FAST_REVERSE;HAVE_FULL_REFLECTION;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_MEMORY_BARRIER;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_REFLECTION_EMIT;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;$(AdditionalConstants)</DefineConstants>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.0' OR '$(TargetFramework)' == 'netstandard1.3'">
     <PackageReference Include="Microsoft.CSharp" Version="4.3.0" />
@@ -67,7 +67,7 @@
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetFramework)' == 'portable-net40+win8+wpa81+wp8+sl5'">
     <AssemblyTitle>Json.NET Portable .NET 4.0</AssemblyTitle>
-    <DefineConstants>PORTABLE40;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_OBSOLETE_FORMATTER_ASSEMBLY_STYLE;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;$(AdditionalConstants)</DefineConstants>
+    <DefineConstants>PORTABLE40;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_OBSOLETE_FORMATTER_ASSEMBLY_STYLE;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;$(AdditionalConstants)</DefineConstants>
     <TargetFrameworkIdentifier>.NETPortable</TargetFrameworkIdentifier>
     <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <TargetFrameworkProfile>Profile328</TargetFrameworkProfile>
@@ -76,7 +76,7 @@
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetFramework)' == 'portable-net45+win8+wpa81+wp8'">
     <AssemblyTitle>Json.NET Portable</AssemblyTitle>
-    <DefineConstants>PORTABLE;HAVE_ASYNC;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DYNAMIC;HAVE_EXPRESSIONS;HAVE_FSHARP_TYPES;HAVE_GUID_TRY_PARSE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_ISET;HAVE_LINQ;HAVE_METHOD_IMPL_ATTRIBUTE;HAVE_READ_ONLY_COLLECTIONS;HAVE_REFLECTION_BINDER;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_OBSOLETE_FORMATTER_ASSEMBLY_STYLE;$(AdditionalConstants)</DefineConstants>
+    <DefineConstants>PORTABLE;HAVE_ASYNC;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DYNAMIC;HAVE_EXPRESSIONS;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_GUID_TRY_PARSE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_ISET;HAVE_LINQ;HAVE_METHOD_IMPL_ATTRIBUTE;HAVE_READ_ONLY_COLLECTIONS;HAVE_REFLECTION_BINDER;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_OBSOLETE_FORMATTER_ASSEMBLY_STYLE;$(AdditionalConstants)</DefineConstants>
     <TargetFrameworkIdentifier>.NETPortable</TargetFrameworkIdentifier>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <TargetFrameworkProfile>Profile259</TargetFrameworkProfile>
diff --git a/Src/Newtonsoft.Json/Utilities/CollectionUtils.cs b/Src/Newtonsoft.Json/Utilities/CollectionUtils.cs
index d15e400e..c69236ad 100644
--- a/Src/Newtonsoft.Json/Utilities/CollectionUtils.cs
+++ b/Src/Newtonsoft.Json/Utilities/CollectionUtils.cs
@@ -251,6 +251,23 @@ namespace Newtonsoft.Json.Utilities
             return -1;
         }
 
+#if HAVE_FAST_REVERSE
+        // faster reverse in .NET Framework with value types - https://github.com/JamesNK/Newtonsoft.Json/issues/1430
+        public static void FastReverse<T>(this List<T> list)
+        {
+            int i = 0;
+            int j = list.Count - 1;
+            while (i < j)
+            {
+                T temp = list[i];
+                list[i] = list[j];
+                list[j] = temp;
+                i++;
+                j--;
+            }
+        }
+#endif
+
         private static IList<int> GetDimensions(IList values, int dimensionsCount)
         {
             IList<int> dimensions = new List<int>();