diff --git a/code/nel/src/3d/driver/opengl/driver_opengl.cpp b/code/nel/src/3d/driver/opengl/driver_opengl.cpp
index 29e14a1a0..08b883e12 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl.cpp
+++ b/code/nel/src/3d/driver/opengl/driver_opengl.cpp
@@ -1488,7 +1488,10 @@ void			CDriverGL::enableUsedTextureMemorySum (bool enable)
 	H_AUTO_OGL(CDriverGL_enableUsedTextureMemorySum )
 
 	if (enable)
+	{	
 		nlinfo ("3D: PERFORMANCE INFO: enableUsedTextureMemorySum has been set to true in CDriverGL");
+		_TextureUsed.reserve(512);
+	}
 	_SumTextureMemoryUsed=enable;
 }
 
@@ -1502,7 +1505,7 @@ uint32			CDriverGL::getUsedTextureMemory() const
 	uint32 memory=0;
 
 	// For each texture used
-	set<CTextureDrvInfosGL*>::const_iterator ite=_TextureUsed.begin();
+	std::vector<CTextureDrvInfosGL *>::const_iterator ite = _TextureUsed.begin();
 	while (ite!=_TextureUsed.end())
 	{
 		// Get the gl texture
@@ -1510,7 +1513,8 @@ uint32			CDriverGL::getUsedTextureMemory() const
 		gltext= (*ite);
 
 		// Sum the memory used by this texture
-		memory+=gltext->TextureMemory;
+		if (gltext)
+			memory+=gltext->TextureMemory;
 
 		// Next texture
 		ite++;
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl.h b/code/nel/src/3d/driver/opengl/driver_opengl.h
index bfe73492d..ee6431dc4 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl.h
+++ b/code/nel/src/3d/driver/opengl/driver_opengl.h
@@ -196,6 +196,8 @@ public:
 
 	bool					initFrameBufferObject(ITexture * tex);
 	bool					activeFrameBufferObject(ITexture * tex);
+
+	std::vector<CTextureDrvInfosGL *>::size_type TextureUsedIdx;
 };
 
 
@@ -1273,7 +1275,7 @@ private:
 	uint32												_NbSetupMaterialCall;
 	uint32												_NbSetupModelMatrixCall;
 	bool												_SumTextureMemoryUsed;
-	std::set<CTextureDrvInfosGL*>						_TextureUsed;
+	std::vector<CTextureDrvInfosGL *>					_TextureUsed;
 	uint							computeMipMapMemoryUsage(uint w, uint h, GLint glfmt) const;
 
 	// VBHard Lock Profiling
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl_texture.cpp b/code/nel/src/3d/driver/opengl/driver_opengl_texture.cpp
index 77954a8e3..055f8d99d 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl_texture.cpp
+++ b/code/nel/src/3d/driver/opengl/driver_opengl_texture.cpp
@@ -79,6 +79,8 @@ CTextureDrvInfosGL::CTextureDrvInfosGL(IDriver *drv, ItTexDrvInfoPtrMap it, CDri
 	InitFBO = false;
 	AttachDepthStencil = true;
 	UsePackedDepthStencil = drvGl->supportPackedDepthStencil();
+
+	TextureUsedIdx = 0;
 }
 // ***************************************************************************
 CTextureDrvInfosGL::~CTextureDrvInfosGL()
@@ -91,7 +93,10 @@ CTextureDrvInfosGL::~CTextureDrvInfosGL()
 	_Driver->_AllocatedTextureMemory-= TextureMemory;
 
 	// release in TextureUsed.
-	_Driver->_TextureUsed.erase (this);
+	if (TextureUsedIdx < _Driver->_TextureUsed.size() && _Driver->_TextureUsed[TextureUsedIdx] == this)
+	{
+		_Driver->_TextureUsed[TextureUsedIdx] = NULL;
+	}
 
 	if(InitFBO)
 	{
@@ -1492,7 +1497,11 @@ bool CDriverGL::activateTexture(uint stage, ITexture *tex)
 			if (_SumTextureMemoryUsed)
 			{
 				// Insert the pointer of this texture
-				_TextureUsed.insert (gltext);
+				if (gltext->TextureUsedIdx >= _TextureUsed.size() || _TextureUsed[gltext->TextureUsedIdx] != gltext)
+				{
+					gltext->TextureUsedIdx = _TextureUsed.size();
+					_TextureUsed.push_back(gltext);
+				}
 			}
 
 			if(tex->isTextureCube())