diff --git a/.gitignore b/.gitignore
index 54c012d..9268917 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,7 @@
 .project
 .pydevproject
 README.md~
+lib/obj/*
+*.so
+*.os
+.sconsign.dblite
diff --git a/lib/build/configure.py b/lib/build/configure.py
deleted file mode 100644
index d99ef90..0000000
--- a/lib/build/configure.py
+++ /dev/null
@@ -1,27 +0,0 @@
-'''
-@author: sylvain
-'''
-
-import os
-import sipconfig
-
-# The name of the SIP build file generated by SIP and used by the build
-# system.
-build_file = "rle.sbf"
-
-# Get the SIP configuration information.
-config = sipconfig.Configuration()
-
-# Run SIP to generate the code.
-os.system(" ".join([config.sip_bin, "-c", ".", "-b", build_file, "../src/rle.sip"]))
-
-# Create the Makefile.
-makefile = sipconfig.SIPModuleMakefile(config, build_file)
-
-# Add the library we are wrapping.  The name doesn't include any platform
-# specific prefixes or extensions (e.g. the "lib" prefix on UNIX, or the
-# ".dll" extension on Windows).
-makefile.extra_libs = ["rle"]
-
-# Generate the Makefile itself.
-makefile.generate()
diff --git a/lib/build/rle.sip b/lib/build/rle.sip
deleted file mode 100644
index 482e3f3..0000000
--- a/lib/build/rle.sip
+++ /dev/null
@@ -1,11 +0,0 @@
-%Module rle
-
-namespace rle {
-%TypeHeaderCode
-#include <rle.h>
-%End
-
-	int decode_uint8(char* output, int width, int height, char* input, int size);
-	int decode_uint16(char* output, int width, int height, char* input, int size);
-	int decode_uint24(char* output, int width, int height, char* input, int size);
-};
\ No newline at end of file
diff --git a/lib/sconstruct b/lib/sconstruct
new file mode 100644
index 0000000..d51ebcd
--- /dev/null
+++ b/lib/sconstruct
@@ -0,0 +1,51 @@
+import os
+import sipconfig
+
+script_dir = os.path.dirname(os.path.realpath(Dir("#/Sconstruct").abspath))
+build_dir = os.path.join(script_dir, "build")
+src_dir = os.path.join(script_dir, "src")
+sip_dir = os.path.join(script_dir, "sip")
+#generate install dir
+install_dir = os.path.join(script_dir, "..", "rdpy", "fast")
+
+def build_sip(target, source, env):
+    # Get the SIP configuration information.
+    config = sipconfig.Configuration()
+    
+    # Run SIP to generate the code.
+    os.system(" ".join([config.sip_bin, "-c", "src", str(source[0])]))
+    
+    # Create the Makefile.
+    #makefile = sipconfig.SIPModuleMakefile(config, str(target[0]))
+    
+    # Add the library we are wrapping.  The name doesn't include any platform
+    # specific prefixes or extensions (e.g. the "lib" prefix on UNIX, or the
+    # ".dll" extension on Windows).
+    #makefile.extra_libs = ["rle"]
+    
+    #add build directory as extra lib
+    #makefile.extra_lib_dirs = [os.path.dirname(str(target[0]))]
+    
+    # Generate the Makefile itself.
+    #makefile.generate()
+
+
+#building library
+env = Environment()
+env.Append(BUILDERS = {'Sip' : Builder(action = build_sip)})
+env.VariantDir('build', 'src', duplicate=0)
+
+cppdefines = {}
+targetName = os.path.join(build_dir, "libfastrdpy.so")
+
+sources = [Glob(os.path.join(src_dir, '*.c'))]
+    
+env.Append(CPPDEFINES = cppdefines);
+
+libSip = env.Sip([os.path.join(build_dir, "rle.sbf")], [os.path.join(sip_dir, "rle.sip")])
+
+libC = env.SharedLibrary(target = targetName, 
+                  source = sources
+                  )
+
+env.Depends(libSip, libC)
diff --git a/lib/sip/rle.sip b/lib/sip/rle.sip
new file mode 100644
index 0000000..0e52d13
--- /dev/null
+++ b/lib/sip/rle.sip
@@ -0,0 +1,9 @@
+%Module(name=rle, language="C")
+
+%UnitCode
+#include <../src/rle.h>
+%End
+
+int rle_decode_uint8(void* output, int width, int height, char* input, int size);
+int rle_decode_uint16(void* output, int width, int height, char* input, int size);
+int rle_decode_uint24(void* output, int width, int height, char* input, int size);
diff --git a/lib/src/rle.cpp b/lib/src/rle.c
similarity index 98%
rename from lib/src/rle.cpp
rename to lib/src/rle.c
index fa921de..90bf3bc 100644
--- a/lib/src/rle.cpp
+++ b/lib/src/rle.c
@@ -1,8 +1,6 @@
 #include "rle_m.h"
 
-namespace test {
-
-int decode_uint8(char* output, int width, int height, char* input, int size)
+int rle_decode_uint8(char* output, int width, int height, char* input, int size)
 {
 	char* prevline;
 	char* line;
@@ -241,7 +239,7 @@ int decode_uint8(char* output, int width, int height, char* input, int size)
 	return 1;
 }
 
-int decode_uint16(char* output, int width, int height, char* input, int size)
+int rle_decode_uint16(char* output, int width, int height, char* input, int size)
 {
 	char* prevline;
 	char* line;
@@ -526,7 +524,7 @@ int decode_uint16(char* output, int width, int height, char* input, int size)
 	return 1;
 }
 
-int decode_uint24(char* output, int width, int height, char* input, int size)
+int rle_decode_uint24(char* output, int width, int height, char* input, int size)
 {
 	char* prevline;
 	char* line;
@@ -832,5 +830,3 @@ int decode_uint24(char* output, int width, int height, char* input, int size)
 	}
 	return 1;
 }
-
-}
diff --git a/lib/src/rle.h b/lib/src/rle.h
index a5154bc..0b206bb 100644
--- a/lib/src/rle.h
+++ b/lib/src/rle.h
@@ -1,10 +1,9 @@
 #ifndef _RLE_H_
 #define _RLE_H_
 
-namespace rle {
-	int decode_uint8(char* output, int width, int height, char* input, int size);
-	int decode_uint16(char* output, int width, int height, char* input, int size);
-	int decode_uint24(char* output, int width, int height, char* input, int size);
-}
+
+int rle_decode_uint8(char* output, int width, int height, char* input, int size);
+int rle_decode_uint16(char* output, int width, int height, char* input, int size);
+int rle_decode_uint24(char* output, int width, int height, char* input, int size);
 
 #endif
diff --git a/rdpy/display/qt.py b/rdpy/display/qt4.py
similarity index 92%
rename from rdpy/display/qt.py
rename to rdpy/display/qt4.py
index af5288f..b5b29f9 100644
--- a/rdpy/display/qt.py
+++ b/rdpy/display/qt4.py
@@ -26,9 +26,8 @@ QRemoteDesktop is a widget use for render in rdpy
 from PyQt4 import QtGui, QtCore
 from rdpy.protocol.rfb.rfb import RFBClientObserver
 from rdpy.protocol.rdp.rdp import RDPClientObserver
+import rdpy.fast.rle as rle
 
-from rdpy.network.type import UInt16Le, UInt24Le, Stream
-import rle
 
 class QAdaptor(object):
     '''
@@ -150,22 +149,24 @@ class RDPClientQt(RDPClientObserver, QAdaptor):
         @param isCompress: use RLE compression
         @param data: bitmap data
         '''
-        
-        imageFormat = None
+        image = None
         if bitsPerPixel == 16:
-            imageFormat = QtGui.QImage.Format_RGB16
             if isCompress:
-                data = rle.decode(Stream(data), width, height, UInt16Le).getvalue()
+                image = QtGui.QImage(width, height, QtGui.QImage.Format_RGB16)
+                data = rle.rle_decode_uint16(image.bits(), width, height, data, len(data))
+            else:
+                image = QtGui.QImage(data, width, height, QtGui.QImage.Format_RGB16)
                 
         elif bitsPerPixel == 24:
-            imageFormat = QtGui.QImage.Format_RGB888
             if isCompress:
-                data = rle.decode(Stream(data), width, height, UInt24Le).getvalue()
+                image = QtGui.QImage(width, height, QtGui.QImage.Format_RGB888)
+                data = rle.rle_decode_uint24(image.bits(), width, height, data, len(data))
+            else:
+                image = QtGui.QImage(data, width, height, QtGui.QImage.Format_RGB24)
         else:
             print "Receive image in bad format"
             return
         
-        image = QtGui.QImage(data, width, height, imageFormat)
         self._widget.notifyImage(destLeft, destTop, image)
 
         
diff --git a/rdpy/display/rle.py b/rdpy/display/rle.py
deleted file mode 100644
index 370dd0b..0000000
--- a/rdpy/display/rle.py
+++ /dev/null
@@ -1,230 +0,0 @@
-#
-# Copyright (c) 2014 Sylvain Peyrefitte
-#
-# This file is part of rdpy.
-#
-# rdpy is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-from rdpy.network.error import InvalidExpectedDataException
-
-"""
-Run length Encoding Algorithm implementation
-
-It's the microsoft view of RLE algorithm
-
-Most of bitmap in RDP protocol use this encoding
-
-@see: http://msdn.microsoft.com/en-us/library/dd240593.aspx
-"""
-from rdpy.network.type import UInt8, UInt16Le, Stream
-
-def decode(src, width, height, colorType):
-    """
-    It's a python transcription of rdesktop algorithm
-    """
-    prevLine = None
-    line = None
-    lastopcode = None
-    x = width
-    insertMix = False
-    biColor = False
-    color1 = colorType()
-    color2 = colorType()
-    mix = ~colorType()
-    mask = UInt8()
-    fom_mask = UInt8()
-    code = UInt8()
-    opcode = UInt8()
-    isFillOrMix = False
-    count = UInt16Le()
-    dst = [colorType()] * width * height
-    
-    while src.dataLen() > 0:
-        #compute orders
-        fom_mask = UInt8()
-        src.readType(code)
-        opcode = code >> 4
-        
-        if opcode == 0xc or opcode == 0xd or opcode == 0xe:
-            opcode -= 6
-            count.value = (code & 0xf).value
-            offset = 16
-        elif opcode == 0xf:
-            opcode = code & 0xf
-            if opcode < 9:
-                src.readType(count)
-            else:
-                count.value = 8 if opcode < 0xb else 1
-            offset = 0
-        else:
-            opcode >>= 1
-            count.value = (code & 0x1f).value
-            offset = 32
-            
-        if offset != 0:
-            isFillOrMix = ((opcode == 2) or (opcode == 7))
-            if count == 0:
-                tmp = UInt8()
-                src.readType(tmp)
-                if isFillOrMix:
-                    count.value = (tmp + 1).value
-                else:
-                    count.value = (tmp + offset).value
-            elif isFillOrMix:
-                count <<= 3
-        
-        
-        if opcode == 0:
-            if not lastopcode is None and lastopcode == opcode and not ((x == width) and (prevLine is None)):
-                insertMix = True
-        elif opcode == 3 or opcode == 8:
-            src.readType(color2)
-            if opcode == 8:
-                src.readType(color1)
-        elif opcode == 6 or opcode == 7:
-            src.readType(mix)
-            opcode -= 5
-        elif opcode == 9:
-            mask.value = 0x03
-            opcode.value = 0x02
-            fom_mask.value = 3
-        elif opcode == 0x0a:
-            mask.value = 0x05;
-            opcode.value = 0x02;
-            fom_mask.value = 5;
-            
-        lastopcode = opcode
-        mixmask = 0
-        
-        while count > 0:
-            if x >= width:
-                if height <= 0:
-                    raise InvalidExpectedDataException("In RLE decompression height must be greater than 0")
-                x = 0
-                height -= 1
-                prevLine = line
-                line = width * height
-            
-            #fill
-            if opcode == 0:
-                if insertMix:
-                    if prevLine is None:
-                        dst[line + x] = mix
-                    else:
-                        dst[line + x] = dst[prevLine + x] ^ mix
-                insertMix = False
-                count -= 1
-                x += 1
-                
-                if prevLine is None:
-                    while count > 0 and x < width:
-                        dst[line + x] = colorType()
-                        count -= 1
-                        x += 1
-                else:
-                    while count > 0 and x < width:
-                        dst[line + x] = dst[prevLine + x]
-                        count -= 1
-                        x += 1
-            #mix
-            elif opcode == 1:
-                if prevLine is None:
-                    while count > 0 and x < width:
-                        dst[line + x] = mix
-                        count -= 1
-                        x += 1
-                else:
-                    while count > 0 and x < width:
-                        dst[line + x] = dst[prevLine + x] ^ mix
-                        count -= 1
-                        x += 1
-            #fill or mix
-            elif opcode == 2:
-                if prevLine is None:
-                    while count > 0 and x < width:
-                        
-                        mixmask <<= 1
-                        if mixmask & 0xff == 0:
-                            if fom_mask:
-                                mask = fom_mask
-                            else:
-                                src.readType(mask)
-                            mixmask = 1
-                            
-                        if mask & mixmask:
-                            dst[line + x] = mix
-                        else:
-                            dst[line + x] = colorType()
-                    count -= 1
-                    x += 1
-                else:
-                    while count > 0 and x < width:
-                        
-                        mixmask <<= 1
-                        if mixmask & 0xff == 0:
-                            if fom_mask:
-                                mask = fom_mask
-                            else:
-                                src.readType(mask)
-                            mixmask = 1
-                            
-                        if mask & mixmask:
-                            dst[line + x] = dst[prevLine + x] ^ mix
-                        else:
-                            dst[line + x] = dst[prevLine + x]
-                            
-                        count -= 1
-                        x += 1
-                
-            #color
-            elif opcode == 3:
-                while count > 0 and x < width:
-                    dst[line + x] = color2
-                    count -= 1
-                    x += 1
-            #copy
-            elif opcode == 4:
-                while count > 0 and x < width:
-                    src.readType(dst[line + x])
-                    count -= 1
-                    x += 1
-            #bicolor
-            elif opcode == 8:
-                while count > 0 and x < width:
-                    if biColor:
-                        dst[line + x] = color2
-                        biColor = False
-                    else:
-                        dst[line + x] = color1
-                        biColor = True
-                        count += 1
-                    count -= 1
-                    x += 1
-            #write
-            elif opcode == 0xd:
-                while count > 0 and x < width:
-                    dst[line + x] = ~colorType()
-                    count -= 1
-                    x += 1
-            elif opcode == 0xe:
-                while count > 0 and x < width:
-                    dst[line + x] = colorType()
-                    count -= 1
-                    x += 1
-            else:
-                raise InvalidExpectedDataException("In RLE decompression invalid opcode")
-    output = Stream()
-    output.writeType(dst)
-    return output        
-                
\ No newline at end of file
diff --git a/rdpy/examples/rdpclient.py b/rdpy/examples/rdpclient.py
index af98e75..7ae897a 100644
--- a/rdpy/examples/rdpclient.py
+++ b/rdpy/examples/rdpclient.py
@@ -28,7 +28,7 @@ import os
 sys.path.insert(1, os.path.join(sys.path[0], '../..'))
 
 from PyQt4 import QtGui
-from rdpy.display.qt import RDPClientQt
+from rdpy.display.qt4 import RDPClientQt
 from rdpy.protocol.rdp import rdp
 
 class RDPClientQtFactory(rdp.ClientFactory):
diff --git a/rdpy/examples/vncclient.py b/rdpy/examples/vncclient.py
index ca44504..e3eedd1 100644
--- a/rdpy/examples/vncclient.py
+++ b/rdpy/examples/vncclient.py
@@ -28,7 +28,7 @@ import os
 sys.path.insert(1, os.path.join(sys.path[0], '../..'))
 
 from PyQt4 import QtGui
-from rdpy.display.qt import RFBClientQt
+from rdpy.display.qt4 import RFBClientQt
 from rdpy.protocol.rfb import rfb
         
 class RFBClientQtFactory(rfb.ClientFactory):
diff --git a/rdpy/fast/__init__.py b/rdpy/fast/__init__.py
new file mode 100644
index 0000000..e69de29