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diff --git a/README.md b/README.md
index c2732295..eb123bab 100644
--- a/README.md
+++ b/README.md
@@ -346,19 +346,40 @@ Examples of using **websocket-sharp**.
 
 Please access [http://localhost:4649](http://localhost:4649) to do WebSocket Echo Test with your web browser after [Example3] running.
 
-## Supported WebSocket Protocol ##
+## Supported WebSocket Protocols ##
 
 **websocket-sharp** supports **[RFC 6455]**.
 
 - **[branch: hybi-00]** supports older draft-ietf-hybi-thewebsocketprotocol-00 ( **[hybi-00]** ).
 - **[branch: draft75]** supports even more old draft-hixie-thewebsocketprotocol-75 ( **[hixie-75]** ).
 
-## Reference ##
+## Supported WebSocket Extensions ##
+
+### Per-message Compression ###
+
+**websocket-sharp** supports **[Per-message Compression]**.
+
+If you want to enable this extension as a WebSocket client, you should do like the following.
+
+```cs
+ws.Compression = CompressionMethod.DEFLATE;
+```
+
+And then your client sends the following header in the opening handshake to a WebSocket server.
+
+```
+Sec-WebSocket-Extensions: permessage-compress; method=deflate
+```
+
+If the server supports this extension, responds the same header. And when your client receives the header, enables this extension.
+
+## References ##
 
 - **[The WebSocket Protocol]**
 - **[The WebSocket API]**
+- **[Per-message Compression]**
 
-Thx for translating to japanese.
+Thanks for translating to japanese.
 
 - **[The WebSocket Protocol 日本語訳]**
 - **[The WebSocket API 日本語訳]**
@@ -383,6 +404,7 @@ Licensed under the **[MIT License]**.
 [Json.NET]: http://james.newtonking.com/projects/json-net.aspx
 [MIT License]: http://www.opensource.org/licenses/mit-license.php
 [Mono]: http://www.mono-project.com/
+[Per-message Compression]: http://tools.ietf.org/html/draft-tyoshino-hybi-permessage-compression-00
 [RFC 6455]: http://tools.ietf.org/html/rfc6455
 [The WebSocket API]: http://www.w3.org/TR/websockets/
 [The WebSocket API 日本語訳]: http://www.hcn.zaq.ne.jp/___/WEB/WebSocket-ja.html
diff --git a/websocket-sharp/CloseEventArgs.cs b/websocket-sharp/CloseEventArgs.cs
index e5fc3614..c0914772 100644
--- a/websocket-sharp/CloseEventArgs.cs
+++ b/websocket-sharp/CloseEventArgs.cs
@@ -54,9 +54,9 @@ namespace WebSocketSharp {
     internal CloseEventArgs(PayloadData data)
       : base(Opcode.CLOSE, data)
     {
-      _code   = getCodeFrom(data);
+      _code = getCodeFrom(data);
       _reason = getReasonFrom(data);
-      _clean  = false;
+      _clean = false;
     }
 
     #endregion
@@ -107,19 +107,22 @@ namespace WebSocketSharp {
 
     #region Private Methods
 
-    private ushort getCodeFrom(PayloadData data)
+    private static ushort getCodeFrom(PayloadData data)
     {
-      return data.Length >= 2
-             ? data.ToByteArray().SubArray(0, 2).To<ushort>(ByteOrder.BIG)
+      var appData = data.ApplicationData;
+      return appData.Length >= 2
+             ? appData.SubArray(0, 2).To<ushort>(ByteOrder.BIG)
              : (ushort)CloseStatusCode.NO_STATUS_CODE;
     }
 
-    private string getReasonFrom(PayloadData data)
+    private static string getReasonFrom(PayloadData data)
     {
-      if (data.Length <= 2)
+      var appData = data.ApplicationData;
+      var appDataLen = appData.Length;
+      if (appDataLen <= 2)
         return String.Empty;
 
-      var buffer = data.ToByteArray().SubArray(2, (int)(data.Length - 2));
+      var buffer = appData.SubArray(2, appDataLen - 2);
       return Encoding.UTF8.GetString(buffer);
     }
 
diff --git a/websocket-sharp/MessageEventArgs.cs b/websocket-sharp/MessageEventArgs.cs
index 89843f01..9f928571 100644
--- a/websocket-sharp/MessageEventArgs.cs
+++ b/websocket-sharp/MessageEventArgs.cs
@@ -50,6 +50,11 @@ namespace WebSocketSharp {
 
     #region Constructors
 
+    internal MessageEventArgs(Opcode type, byte[] data)
+      : this(type, new PayloadData(data))
+    {
+    }
+
     internal MessageEventArgs(Opcode type, PayloadData data)
     {
       _type = type;
diff --git a/websocket-sharp/PayloadData.cs b/websocket-sharp/PayloadData.cs
index 34053b3f..69bca92f 100644
--- a/websocket-sharp/PayloadData.cs
+++ b/websocket-sharp/PayloadData.cs
@@ -30,7 +30,6 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
-using System.IO.Compression;
 using System.Linq;
 using System.Text;
 
@@ -138,43 +137,6 @@ namespace WebSocketSharp {
 
     #region Internal Methods
 
-    internal bool Compress(CompressionMethod method)
-    {
-      try
-      {
-        if (method == CompressionMethod.NONE)
-          return false;
-
-        if (ExtensionData.LongLength > 0)
-          return false;
-
-        ApplicationData = ApplicationData.Compress(method);
-        return true;
-      }
-      catch
-      {
-        return false;
-      }
-    }
-
-    internal bool Decompress(CompressionMethod method)
-    {
-      try
-      {
-        if (method == CompressionMethod.NONE)
-          return false;
-
-        if (ApplicationData.LongLength > 0)
-          ApplicationData = ApplicationData.Decompress(method);
-
-        return true;
-      }
-      catch
-      {
-        return false;
-      }
-    }
-
     #endregion
 
     #region Public Methods
diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index d91cb1de..69dc2340 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -76,7 +76,6 @@ namespace WebSocketSharp {
     private Object            _forClose;
     private Object            _forSend;
     private string            _origin;
-    private bool              _perFrameCompress;
     private string            _protocol;
     private string            _protocols;
     private volatile WsState  _readyState;
@@ -98,7 +97,6 @@ namespace WebSocketSharp {
       _forClose = new Object();
       _forSend = new Object();
       _origin = String.Empty;
-      _perFrameCompress = false;
       _protocol = String.Empty;
       _readyState = WsState.CONNECTING;
     }
@@ -576,18 +574,14 @@ namespace WebSocketSharp {
 
     private static WsFrame createControlFrame(Opcode opcode, PayloadData payloadData, bool client)
     {
-      var mask = client ? Mask.MASK : Mask.UNMASK;
-      return new WsFrame(opcode, mask, payloadData);
+      return createFrame(Fin.FINAL, opcode, payloadData, false, client);
     }
 
-    private static WsFrame createDataFrame(
-      Fin fin, Opcode opcode, PayloadData payloadData, CompressionMethod method, bool compressed, bool client)
+    private static WsFrame createFrame(
+      Fin fin, Opcode opcode, PayloadData payloadData, bool compressed, bool client)
     {
       var mask = client ? Mask.MASK : Mask.UNMASK;
-      var compress = compressed ? CompressionMethod.NONE : method;
-      var frame = new WsFrame(fin, opcode, mask, payloadData, compress);
-      if (compressed)
-        frame.PerMessageCompressed = true;
+      var frame = new WsFrame(fin, opcode, mask, payloadData, compressed);
 
       return frame;
     }
@@ -716,18 +710,6 @@ namespace WebSocketSharp {
       return true;
     }
 
-    // As server
-    private static bool isPerFrameCompressExtension(string value)
-    {
-      if (value.Equals("deflate-frame"))
-        return true;
-
-      if (value.Equals("perframe-compress; method=deflate"))
-        return true;
-
-      return false;
-    }
-
     // As server
     private bool isValidHostHeader()
     {
@@ -776,10 +758,7 @@ namespace WebSocketSharp {
         if (!contFrame.IsContinuation)
           return false;
 
-        if (contFrame.IsCompressed)
-          contFrame.Decompress(_compression);
-
-        dest.WriteBytes(contFrame.PayloadData.ToByteArray());
+        dest.WriteBytes(contFrame.PayloadData.ApplicationData);
         return true;
       };
 
@@ -921,10 +900,11 @@ namespace WebSocketSharp {
       if (frame.IsCompressed && _compression == CompressionMethod.NONE)
         return false;
 
-      if (frame.IsCompressed)
-        frame.Decompress(_compression);
+      var data = frame.IsCompressed
+               ? new PayloadData(frame.PayloadData.ApplicationData.Decompress(_compression))
+               : frame.PayloadData;
 
-      onMessage(new MessageEventArgs(frame.Opcode, frame.PayloadData));
+      onMessage(new MessageEventArgs(frame.Opcode, data));
       return true;
     }
 
@@ -938,8 +918,10 @@ namespace WebSocketSharp {
       if (frame.IsFinal)
         return false;
 
-      // First fragment
-      if (frame.IsData && !(frame.IsCompressed && _compression == CompressionMethod.NONE))
+      bool incorrect = !frame.IsData ||
+                       frame.IsCompressed && _compression == CompressionMethod.NONE;
+
+      if (!incorrect)
         processFragments(frame);
       else
         processIncorrectFrame();
@@ -951,15 +933,12 @@ namespace WebSocketSharp {
     {
       using (var merge = new MemoryStream())
       {
-        if (first.IsCompressed && _perFrameCompress)
-          first.Decompress(_compression);
-
-        merge.WriteBytes(first.PayloadData.ToByteArray());
+        merge.WriteBytes(first.PayloadData.ApplicationData);
         if (!mergeFragments(merge))
           return;
 
         byte[] data;
-        if (_compression != CompressionMethod.NONE && !_perFrameCompress)
+        if (_compression != CompressionMethod.NONE)
         {
           data = merge.DecompressToArray(_compression);
         }
@@ -969,7 +948,7 @@ namespace WebSocketSharp {
           data = merge.ToArray();
         }
 
-        onMessage(new MessageEventArgs(first.Opcode, new PayloadData(data)));
+        onMessage(new MessageEventArgs(first.Opcode, data));
       }
     }
 
@@ -1032,26 +1011,11 @@ namespace WebSocketSharp {
       {
         var e = extension.Trim();
         var tmp = e.RemovePrefix("x-webkit-");
-        if (!compress)
+        if (!compress && isCompressExtension(tmp, CompressionMethod.DEFLATE))
         {
-          if (isPerFrameCompressExtension(tmp))
-          {
-            _perFrameCompress = true;
-            _compression = CompressionMethod.DEFLATE;
-            compress = true;
-          }
-
-          if (!compress && isCompressExtension(tmp, CompressionMethod.DEFLATE))
-          {
-            _compression = CompressionMethod.DEFLATE;
-            compress = true;
-          }
-
-          if (compress)
-          {
-            buffer.Add(e);
-            continue;
-          }
+          _compression = CompressionMethod.DEFLATE;
+          compress = true;
+          buffer.Add(e);
         }
       }
 
@@ -1216,7 +1180,7 @@ namespace WebSocketSharp {
 
     private void send(Opcode opcode, Stream stream)
     {
-      if (_compression == CompressionMethod.NONE || _perFrameCompress)
+      if (_compression == CompressionMethod.NONE)
       {
         send(opcode, stream, false);
         return;
@@ -1255,8 +1219,7 @@ namespace WebSocketSharp {
 
     private bool send(Fin fin, Opcode opcode, byte[] data, bool compressed)
     {
-      var frame = createDataFrame(
-        fin, opcode, new PayloadData(data), _compression, compressed, _client);
+      var frame = createFrame(fin, opcode, new PayloadData(data), compressed, _client);
       return send(frame);
     }
 
diff --git a/websocket-sharp/WsFrame.cs b/websocket-sharp/WsFrame.cs
index bd362660..c5c3f625 100644
--- a/websocket-sharp/WsFrame.cs
+++ b/websocket-sharp/WsFrame.cs
@@ -63,12 +63,12 @@ namespace WebSocketSharp {
     }
 
     public WsFrame(Fin fin, Opcode opcode, Mask mask, PayloadData payloadData)
-      : this(fin, opcode, mask, payloadData, CompressionMethod.NONE)
+      : this(fin, opcode, mask, payloadData, false)
     {
     }
 
     public WsFrame(
-      Fin fin, Opcode opcode, Mask mask, PayloadData payloadData, CompressionMethod compress)
+      Fin fin, Opcode opcode, Mask mask, PayloadData payloadData, bool compressed)
     {
       if (payloadData.IsNull())
         throw new ArgumentNullException("payloadData");
@@ -80,18 +80,14 @@ namespace WebSocketSharp {
       if (!isFinal(fin) && isControl(opcode))
         throw new ArgumentException("The control frame must not be fragmented.");
 
-      if (isControl(opcode) && compress != CompressionMethod.NONE)
+      if (isControl(opcode) && compressed)
         throw new ArgumentException("The control frame must not be compressed.");
 
       Fin = fin;
-      Rsv1 = Rsv.OFF;
-      Rsv2 = Rsv.OFF;
-      Rsv3 = Rsv.OFF;
+      Rsv1 = isData(opcode) && compressed ? Rsv.ON : Rsv.OFF;
       Opcode = opcode;
       Mask = mask;
       PayloadData = payloadData;
-      if (compress != CompressionMethod.NONE)
-        compressPayloadData(compress);
 
       init();
     }
@@ -219,26 +215,6 @@ namespace WebSocketSharp {
 
     #region Private Methods
 
-    private bool compressPayloadData(CompressionMethod method)
-    {
-      if (!PayloadData.Compress(method))
-        return false;
-
-      if (IsData)
-        Rsv1 = Rsv.ON;
-
-      return true;
-    }
-
-    private bool decompressPayloadData(CompressionMethod method)
-    {
-      if (!PayloadData.Decompress(method))
-        return false;
-
-      Rsv1 = Rsv.OFF;
-      return true;
-    }
-
     private static void dump(WsFrame frame)
     {
       var len = frame.Length;
@@ -311,6 +287,8 @@ namespace WebSocketSharp {
 
     private void init()
     {
+      Rsv2 = Rsv.OFF;
+      Rsv3 = Rsv.OFF;
       setPayloadLen(PayloadData.Length);
       if (IsMasked)
         maskPayloadData();
@@ -560,19 +538,6 @@ namespace WebSocketSharp {
 
     #endregion
 
-    #region Internal Methods
-
-    internal void Decompress(CompressionMethod method)
-    {
-      if (Mask == Mask.MASK)
-        unmaskPayloadData();
-
-      if (decompressPayloadData(method))
-        setPayloadLen(PayloadData.Length);
-    }
-
-    #endregion
-
     #region Public Methods
 
     public IEnumerator<byte> GetEnumerator()
diff --git a/websocket-sharp/bin/Debug/websocket-sharp.dll b/websocket-sharp/bin/Debug/websocket-sharp.dll
index fe3951ba..57dd7bdf 100755
Binary files a/websocket-sharp/bin/Debug/websocket-sharp.dll and b/websocket-sharp/bin/Debug/websocket-sharp.dll differ
diff --git a/websocket-sharp/bin/Debug/websocket-sharp.dll.mdb b/websocket-sharp/bin/Debug/websocket-sharp.dll.mdb
index 61e329d0..e5e66409 100644
Binary files a/websocket-sharp/bin/Debug/websocket-sharp.dll.mdb and b/websocket-sharp/bin/Debug/websocket-sharp.dll.mdb differ
diff --git a/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll b/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll
index a868c718..c80dd6d9 100755
Binary files a/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll and b/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll differ
diff --git a/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll.mdb b/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll.mdb
index 97c87fac..e3582a6b 100644
Binary files a/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll.mdb and b/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll.mdb differ
diff --git a/websocket-sharp/bin/Release/websocket-sharp.dll b/websocket-sharp/bin/Release/websocket-sharp.dll
index 5cb2e8a3..9f4c0c65 100755
Binary files a/websocket-sharp/bin/Release/websocket-sharp.dll and b/websocket-sharp/bin/Release/websocket-sharp.dll differ
diff --git a/websocket-sharp/bin/Release_Ubuntu/websocket-sharp.dll b/websocket-sharp/bin/Release_Ubuntu/websocket-sharp.dll
index 89c7e9fd..4b57a6a1 100755
Binary files a/websocket-sharp/bin/Release_Ubuntu/websocket-sharp.dll and b/websocket-sharp/bin/Release_Ubuntu/websocket-sharp.dll differ
diff --git a/websocket-sharp/doc/mdoc/index.xml b/websocket-sharp/doc/mdoc/index.xml
index 560a4eec..dff297a2 100644
--- a/websocket-sharp/doc/mdoc/index.xml
+++ b/websocket-sharp/doc/mdoc/index.xml
@@ -1,6 +1,6 @@
 <Overview>
   <Assemblies>
-    <Assembly Name="websocket-sharp" Version="1.0.2.4444">
+    <Assembly Name="websocket-sharp" Version="1.0.2.30839">
       <AssemblyPublicKey>[00 24 00 00 04 80 00 00 94 00 00 00 06 02 00 00 00 24 00 00 52 53 41 31 00 04 00 00 11 00 00 00 29 17 fb 89 fe c3 91 f7 2b cb 8b e2 61 d2 3f 05 93 6d 65 a8 9e 63 72 a6 f5 d5 2c f2 9d 20 fa 0b c0 70 6a f6 88 7e 8b 90 3f 39 f5 76 c8 48 e0 bb 7b b2 7b ed d3 10 a7 1a 0f 70 98 0f 7f f4 4b 53 09 d2 a5 ef 36 c3 56 b4 aa f0 91 72 63 25 07 89 e0 93 3e 3f 2e f2 b9 73 0e 12 15 5d 43 56 c3 f4 70 a5 89 fe f7 f6 ac 3e 77 c2 d8 d0 84 91 f4 0c d1 f3 8e dc c3 c3 b8 38 3d 0c bf 17 de 20 78 c1 ]</AssemblyPublicKey>
       <Attributes>
         <Attribute>
diff --git a/websocket-sharp/websocket-sharp.pidb b/websocket-sharp/websocket-sharp.pidb
index 0aea65fd..c8f7d8cb 100644
Binary files a/websocket-sharp/websocket-sharp.pidb and b/websocket-sharp/websocket-sharp.pidb differ