diff --git a/code/nel/src/3d/driver/opengl3/driver_opengl.cpp b/code/nel/src/3d/driver/opengl3/driver_opengl.cpp
index f2f287408..c43005b6e 100644
--- a/code/nel/src/3d/driver/opengl3/driver_opengl.cpp
+++ b/code/nel/src/3d/driver/opengl3/driver_opengl.cpp
@@ -240,7 +240,6 @@ CDriverGL3::CDriverGL3()
 	_CurrentVertexBufferGL= NULL;
 	/*_NVCurrentVARPtr= NULL;
 	_NVCurrentVARSize= 0;*/
-	_SlowUnlockVBHard= true;
 
 	_AllocatedTextureMemory= 0;
 
diff --git a/code/nel/src/3d/driver/opengl3/driver_opengl.h b/code/nel/src/3d/driver/opengl3/driver_opengl.h
index e7fc173db..2d52e6446 100644
--- a/code/nel/src/3d/driver/opengl3/driver_opengl.h
+++ b/code/nel/src/3d/driver/opengl3/driver_opengl.h
@@ -1131,7 +1131,6 @@ private:
 
 	// The VertexBufferHardGL activated.
 	IVertexBufferGL					*_CurrentVertexBufferGL;
-	bool							_SlowUnlockVBHard;
 	GLenum							vertexBufferUsageGL3(CVertexBuffer::TPreferredMemory usage);
 
 	// Handle lost buffers
diff --git a/code/nel/src/3d/driver/opengl3/driver_opengl_vertex.cpp b/code/nel/src/3d/driver/opengl3/driver_opengl_vertex.cpp
index a30e42682..8ef0e4c3a 100644
--- a/code/nel/src/3d/driver/opengl3/driver_opengl_vertex.cpp
+++ b/code/nel/src/3d/driver/opengl3/driver_opengl_vertex.cpp
@@ -230,7 +230,7 @@ bool			CDriverGL3::supportVolatileVertexBuffer() const
 bool			CDriverGL3::slowUnlockVertexBufferHard() const
 {
 	H_AUTO_OGL(CDriverGL3_slowUnlockVertexBufferHard)
-	return _SlowUnlockVBHard;
+	return false;
 }
 
 
@@ -500,8 +500,6 @@ bool			CDriverGL3::initVertexBufferHard(uint agpMem, uint vramMem)
 {
 	H_AUTO_OGL(CDriverGL3_initVertexBufferHard)
 
-	_SlowUnlockVBHard = true;
-
 	return true;
 }
 
diff --git a/code/nel/src/3d/driver/opengl3/driver_opengl_vertex_buffer.cpp b/code/nel/src/3d/driver/opengl3/driver_opengl_vertex_buffer.cpp
index 61130fb54..ef43e156b 100644
--- a/code/nel/src/3d/driver/opengl3/driver_opengl_vertex_buffer.cpp
+++ b/code/nel/src/3d/driver/opengl3/driver_opengl_vertex_buffer.cpp
@@ -131,7 +131,6 @@ void *CVertexBufferGL::lock()
 	}
 	m_Driver->_DriverGLStates.bindARBVertexBuffer(VertexObjectId);
 
-
 	// m_VertexPtr = nglMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
 	
 	// PERFORMANCE: AMD: This brings framerate from 24fps to 38fps, glitches with volatile buffers such as animated models and gui, likely glitches with others
@@ -146,10 +145,13 @@ void *CVertexBufferGL::lock()
 	{
 	case CVertexBuffer::AGPVolatile:
 	case CVertexBuffer::RAMVolatile:
+		// NOTE: GL_MAP_INVALIDATE_BUFFER_BIT removes the cost of waiting for synchronization (major performance impact), 
+		// but adds the cost of allocating a new buffer (which hast a much lower performance impact)
 		m_VertexPtr = nglMapBufferRange(GL_ARRAY_BUFFER, 0, size, GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);
 		break;
 	case CVertexBuffer::RAMPreferred:
-		// m_VertexPtr = nglMapBufferRange(GL_ARRAY_BUFFER, 0, size, GL_MAP_WRITE_BIT | GL_MAP_READ_BIT);
+		// m_VertexPtr = nglMapBufferRange(GL_ARRAY_BUFFER, 0, size, GL_MAP_WRITE_BIT | GL_MAP_READ_BIT | GL_MAP_PERSISTENT | GL_MAP_COHERENT);
+		// NOTE: Persistent / Coherent is only available in OpenGL 4.4 (2013/2014 hardware with recent drivers)
 		m_VertexPtr = nglMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
 		break;
 	default: