diff --git a/src/rendering/polyrenderer/backend/poly_framebuffer.cpp b/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
index 023298806..8edca2e0e 100644
--- a/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
+++ b/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
@@ -49,12 +49,12 @@ extern FString gpuStatOutput;
 
 #ifdef WIN32
 void I_PolyPresentInit();
-uint8_t *I_PolyPresentLock(int w, int h, int &pitch);
+uint8_t *I_PolyPresentLock(int w, int h, bool vsync, int &pitch);
 void I_PolyPresentUnlock(int x, int y, int w, int h);
 void I_PolyPresentDeinit();
 #else
 void I_PolyPresentInit() { }
-uint8_t *I_PolyPresentLock(int w, int h, int &pitch) { pitch = 0; return nullptr; }
+uint8_t *I_PolyPresentLock(int w, int h, bool vsync, int &pitch) { pitch = 0; return nullptr; }
 void I_PolyPresentUnlock(int x, int y, int w, int h) { }
 void I_PolyPresentDeinit() { }
 #endif
@@ -157,7 +157,7 @@ void PolyFrameBuffer::Update()
 		int pixelsize = 4;
 		const uint8_t *src = (const uint8_t*)mCanvas->GetPixels();
 		int pitch = 0;
-		uint8_t *dst = I_PolyPresentLock(w, h, pitch);
+		uint8_t *dst = I_PolyPresentLock(w, h, cur_vsync, pitch);
 		if (dst)
 		{
 #if 1
@@ -444,7 +444,7 @@ uint32_t PolyFrameBuffer::GetCaps()
 
 void PolyFrameBuffer::SetVSync(bool vsync)
 {
-	// This is handled in PolySwapChain::AcquireImage.
+	cur_vsync = vsync;
 }
 
 void PolyFrameBuffer::CleanForRestart()
diff --git a/src/rendering/polyrenderer/backend/poly_framebuffer.h b/src/rendering/polyrenderer/backend/poly_framebuffer.h
index 08494a117..ba35b5a16 100644
--- a/src/rendering/polyrenderer/backend/poly_framebuffer.h
+++ b/src/rendering/polyrenderer/backend/poly_framebuffer.h
@@ -83,6 +83,8 @@ private:
 	std::unique_ptr<PolyDepthStencil> mDepthStencil;
 	std::shared_ptr<DrawerCommandQueue> mDrawCommands;
 	RenderMemory mFrameMemory;
+
+	bool cur_vsync = false;
 };
 
 inline PolyFrameBuffer *GetPolyFrameBuffer() { return static_cast<PolyFrameBuffer*>(screen); }
diff --git a/src/win32/win32polyvideo.cpp b/src/win32/win32polyvideo.cpp
index a6e74218a..2c2111979 100644
--- a/src/win32/win32polyvideo.cpp
+++ b/src/win32/win32polyvideo.cpp
@@ -19,14 +19,14 @@ namespace
 	int ClientHeight = 0;
 	bool CurrentVSync = false;
 
-	IDirect3D9 *d3d9 = nullptr;
-	IDirect3DDevice9 *device = nullptr;
-	IDirect3DSurface9 *surface = nullptr;
+	IDirect3D9Ex *d3d9 = nullptr;
+	IDirect3DDevice9Ex *device = nullptr;
+	IDirect3DSurface9* surface = nullptr;
 }
 
 void I_PolyPresentInit()
 {
-	d3d9 = Direct3DCreate9(D3D_SDK_VERSION);
+	Direct3DCreate9Ex(D3D_SDK_VERSION, &d3d9);
 	if (!d3d9)
 	{
 		I_FatalError("Direct3DCreate9 failed");
@@ -35,33 +35,32 @@ void I_PolyPresentInit()
 	RECT rect = {};
 	GetClientRect(Window, &rect);
 
-	CurrentVSync = vid_vsync;
 	ClientWidth = rect.right;
 	ClientHeight = rect.bottom;
 
 	D3DPRESENT_PARAMETERS pp = {};
 	pp.Windowed = true;
-	pp.SwapEffect = D3DSWAPEFFECT_DISCARD;
+	pp.SwapEffect = D3DSWAPEFFECT_FLIPEX;
 	pp.BackBufferWidth = ClientWidth;
 	pp.BackBufferHeight = ClientHeight;
 	pp.BackBufferCount = 1;
 	pp.hDeviceWindow = Window;
-	pp.PresentationInterval = CurrentVSync ? D3DPRESENT_INTERVAL_ONE : D3DPRESENT_INTERVAL_IMMEDIATE;
+	pp.PresentationInterval = CurrentVSync ? D3DPRESENT_INTERVAL_DEFAULT : D3DPRESENT_INTERVAL_IMMEDIATE;
 
-	HRESULT result = d3d9->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, Window, D3DCREATE_HARDWARE_VERTEXPROCESSING, &pp, &device);
+	HRESULT result = d3d9->CreateDeviceEx(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, Window, D3DCREATE_HARDWARE_VERTEXPROCESSING, &pp, nullptr, &device);
 	if (FAILED(result))
 	{
 		I_FatalError("IDirect3D9.CreateDevice failed");
 	}
 }
 
-uint8_t *I_PolyPresentLock(int w, int h, int &pitch)
+uint8_t *I_PolyPresentLock(int w, int h, bool vsync, int &pitch)
 {
 	HRESULT result;
 
 	RECT rect = {};
 	GetClientRect(Window, &rect);
-	if (rect.right != ClientWidth || rect.bottom != ClientHeight || CurrentVSync != vid_vsync)
+	if (rect.right != ClientWidth || rect.bottom != ClientHeight || CurrentVSync != vsync)
 	{
 		if (surface)
 		{
@@ -69,18 +68,18 @@ uint8_t *I_PolyPresentLock(int w, int h, int &pitch)
 			surface = nullptr;
 		}
 
-		CurrentVSync = vid_vsync;
+		CurrentVSync = vsync;
 		ClientWidth = rect.right;
 		ClientHeight = rect.bottom;
 
 		D3DPRESENT_PARAMETERS pp = {};
 		pp.Windowed = true;
-		pp.SwapEffect = D3DSWAPEFFECT_DISCARD;
+		pp.SwapEffect = D3DSWAPEFFECT_FLIPEX;
 		pp.BackBufferWidth = ClientWidth;
 		pp.BackBufferHeight = ClientHeight;
 		pp.BackBufferCount = 1;
 		pp.hDeviceWindow = Window;
-		pp.PresentationInterval = CurrentVSync ? D3DPRESENT_INTERVAL_ONE : D3DPRESENT_INTERVAL_IMMEDIATE;
+		pp.PresentationInterval = CurrentVSync ? D3DPRESENT_INTERVAL_DEFAULT : D3DPRESENT_INTERVAL_IMMEDIATE;
 		device->Reset(&pp);
 	}
 
@@ -173,7 +172,7 @@ void I_PolyPresentUnlock(int x, int y, int width, int height)
 
 		result = device->EndScene();
 		if (SUCCEEDED(result))
-			device->Present(nullptr, nullptr, 0, nullptr);
+			device->PresentEx(nullptr, nullptr, 0, nullptr, CurrentVSync ? 0 : D3DPRESENT_FORCEIMMEDIATE);
 	}
 
 	backbuffer->Release();