diff --git a/plugins/GSdx/GSDevice10.cpp b/plugins/GSdx/GSDevice10.cpp
index 16300445a..a8d832631 100644
--- a/plugins/GSdx/GSDevice10.cpp
+++ b/plugins/GSdx/GSDevice10.cpp
@@ -87,7 +87,7 @@ bool GSDevice10::Create(GSWnd* wnd, bool vsync)
 	scd.Windowed = TRUE;
 
 	uint32 flags = 0;
-
+	flags = D3D10_CREATE_DEVICE_SINGLETHREADED;  //disables thread safety, should be fine (speedup)
 #ifdef DEBUG
 	flags |= D3D10_CREATE_DEVICE_DEBUG;
 #endif
diff --git a/plugins/GSdx/GSDevice11.cpp b/plugins/GSdx/GSDevice11.cpp
index d8eadcb89..aa6547dd4 100644
--- a/plugins/GSdx/GSDevice11.cpp
+++ b/plugins/GSdx/GSDevice11.cpp
@@ -87,7 +87,7 @@ bool GSDevice11::Create(GSWnd* wnd, bool vsync)
 	scd.Windowed = TRUE;
 
 	uint32 flags = 0;
-
+	flags = D3D11_CREATE_DEVICE_SINGLETHREADED;  //disables thread safety, should be fine (speedup)
 #ifdef DEBUG
 	flags |= D3D11_CREATE_DEVICE_DEBUG;
 #endif
diff --git a/plugins/GSdx/GSDevice9.cpp b/plugins/GSdx/GSDevice9.cpp
index b71aa4ec1..0889fb51e 100644
--- a/plugins/GSdx/GSDevice9.cpp
+++ b/plugins/GSdx/GSDevice9.cpp
@@ -304,7 +304,8 @@ bool GSDevice9::Reset(int w, int h, int mode)
 
 	if(!m_dev)
 	{
-		uint32 flags = D3DCREATE_MULTITHREADED | (m_d3dcaps.VertexProcessingCaps ? D3DCREATE_HARDWARE_VERTEXPROCESSING : D3DCREATE_SOFTWARE_VERTEXPROCESSING);
+		//D3DCREATE_MULTITHREADED flag shouldn't be needed
+		uint32 flags = m_d3dcaps.VertexProcessingCaps ? D3DCREATE_HARDWARE_VERTEXPROCESSING : D3DCREATE_SOFTWARE_VERTEXPROCESSING;
 
 		hr = m_d3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, (HWND)m_wnd->GetHandle(), flags, &m_pp, &m_dev);