diff --git a/build.sh b/build.sh
index d61241b081..c4a2b4251f 100755
--- a/build.sh
+++ b/build.sh
@@ -23,7 +23,7 @@ do
 		--dev|--devel)
 			flags="$flags -DCMAKE_BUILD_TYPE=Devel"
 			;;
-		--debug)
+		--dbg|--debug)
 			flags="$flags -DCMAKE_BUILD_TYPE=Debug"
 			;;
 		--release)
diff --git a/plugins/GSdx/CMakeLists.txt b/plugins/GSdx/CMakeLists.txt
index 4155128d05..d3a4a2c703 100644
--- a/plugins/GSdx/CMakeLists.txt
+++ b/plugins/GSdx/CMakeLists.txt
@@ -32,7 +32,7 @@ endif(CMAKE_BUILD_TYPE STREQUAL Debug)
 
 # Devel - Build
 if(CMAKE_BUILD_TYPE STREQUAL Devel)
-    add_definitions(${CommonFlags} ${OptimizationFlags} -g -W)
+    add_definitions(${CommonFlags} ${OptimizationFlags} -D_DEVEL -g -W)
 endif(CMAKE_BUILD_TYPE STREQUAL Devel)
 
 # Release - Build
diff --git a/plugins/GSdx/GS.cpp b/plugins/GSdx/GS.cpp
index 53f60e82d3..a4c90a443a 100644
--- a/plugins/GSdx/GS.cpp
+++ b/plugins/GSdx/GS.cpp
@@ -1628,6 +1628,9 @@ EXPORT_C GSReplay(char* lpszCmdLine, int renderer)
 			fprintf(stderr, "Mean by frame: %fms (%ffps)\n", mean/(float)frame_number, 1000.0f*frame_number/mean);
 			fprintf(stderr, "Standard deviatin by frame: %fms\n", sd/(float)frame_number);
 		}
+#ifdef ENABLE_OGL_DEBUG_MEM_BW
+		fprintf(stderr, "memory bandwith. T: %f. V: %f\n", (float)g_texture_upload_byte/(float)frame_number/1024, (float)g_vertex_upload_byte/(float)frame_number/1024);
+#endif
 
 		for(auto i = packets.begin(); i != packets.end(); i++)
 		{
diff --git a/plugins/GSdx/GSDeviceOGL.cpp b/plugins/GSdx/GSDeviceOGL.cpp
index eb15831b26..5d34ff4978 100644
--- a/plugins/GSdx/GSDeviceOGL.cpp
+++ b/plugins/GSdx/GSDeviceOGL.cpp
@@ -31,6 +31,10 @@
 
 static uint32 g_draw_count = 0;
 static uint32 g_frame_count = 1;		
+#ifdef ENABLE_OGL_DEBUG_MEM_BW
+uint32 g_texture_upload_byte = 0;
+uint32 g_vertex_upload_byte = 0;
+#endif
 
 static const uint32 g_merge_cb_index      = 10;
 static const uint32 g_interlace_cb_index  = 11;
diff --git a/plugins/GSdx/GSDeviceOGL.h b/plugins/GSdx/GSDeviceOGL.h
index fb16f68e2e..a1680a898f 100644
--- a/plugins/GSdx/GSDeviceOGL.h
+++ b/plugins/GSdx/GSDeviceOGL.h
@@ -29,6 +29,11 @@
 #include "GSShaderOGL.h"
 #include "GLState.h"
 
+#ifdef ENABLE_OGL_DEBUG_MEM_BW
+extern uint32 g_texture_upload_byte;
+extern uint32 g_vertex_upload_byte;
+#endif
+
 class GSBlendStateOGL {
 	// Note: You can also select the index of the draw buffer for which to set the blend setting
 	// We will keep basic the first try
diff --git a/plugins/GSdx/GSTextureOGL.cpp b/plugins/GSdx/GSTextureOGL.cpp
index 43be81e9b3..cfe2272e26 100644
--- a/plugins/GSdx/GSTextureOGL.cpp
+++ b/plugins/GSdx/GSTextureOGL.cpp
@@ -24,6 +24,10 @@
 #include "GSTextureOGL.h"
 #include "GLState.h"
 
+#ifdef ENABLE_OGL_DEBUG_MEM_BW
+extern uint32 g_texture_upload_byte;
+#endif
+
 // FIXME OGL4: investigate, only 1 unpack buffer always bound
 namespace PboPool {
 	
@@ -341,6 +345,10 @@ bool GSTextureOGL::Update(const GSVector4i& r, const void* data, int pitch)
 		}
 		src += pitch;
 		map += line_size;
+
+#ifdef ENABLE_OGL_DEBUG_MEM_BW
+		g_texture_upload_byte += line_size;
+#endif
 	}
 
 	PboPool::Unmap();
diff --git a/plugins/GSdx/GSVertexArrayOGL.h b/plugins/GSdx/GSVertexArrayOGL.h
index c85ae6743f..7e62c0c8d4 100644
--- a/plugins/GSdx/GSVertexArrayOGL.h
+++ b/plugins/GSdx/GSVertexArrayOGL.h
@@ -21,6 +21,12 @@
 
 #pragma once
 
+#include "config.h"
+
+#ifdef ENABLE_OGL_DEBUG_MEM_BW
+extern uint32 g_vertex_upload_byte;
+#endif
+
 struct GSInputLayoutOGL {
 	GLuint  index;
 	GLint   size;
@@ -146,6 +152,9 @@ class GSBufferOGL {
 				data[i] += basevertex;
 			}
 		}
+#endif
+#ifdef ENABLE_OGL_DEBUG_MEM_BW
+		g_vertex_upload_byte += count*m_stride;
 #endif
 		if (m_sub_data_config && !m_buffer_storage) {
 			subdata_upload(src, count);
diff --git a/plugins/GSdx/config.h b/plugins/GSdx/config.h
index c8a2aa9556..3ad4756bc9 100644
--- a/plugins/GSdx/config.h
+++ b/plugins/GSdx/config.h
@@ -38,9 +38,10 @@
 
 //#define DISABLE_DATE
 
-#ifdef _DEBUG
+#if defined(_DEBUG) || defined(_DEVEL)
 #define ENABLE_OGL_DEBUG   // Create a debug context and check opengl command status. Allow also to dump various textures/states.
 #endif
+//#define ENABLE_OGL_DEBUG_MEM_BW // compute the quantity of data transfered (debug purpose)
 
 // Output stencil to a color buffer
 //#define ENABLE_OGL_STENCIL_DEBUG