Index: source/main.cpp
===================================================================
--- source/main.cpp
+++ source/main.cpp
@@ -369,9 +369,9 @@
 	g_UserReporter.Update();
 
 	g_Console->Update(realTimeSinceLastFrame);
-
+	bool inFullScreen = g_VideoMode.isInFullscreen();
 	ogl_WarnIfError();
-	if (need_render)
+	if (need_render && !g_app_minimized && ((g_app_has_focus && inFullScreen) || !inFullScreen))
 	{
 		Render();
 
Index: source/ps/VideoMode.h
===================================================================
--- source/ps/VideoMode.h
+++ source/ps/VideoMode.h
@@ -53,6 +53,11 @@
 	bool SetFullscreen(bool fullscreen);
 
 	/**
+	* Returns true if window runs in fullscreen mode
+	*/
+	bool isInFullscreen();
+
+	/**
 	 * Switch between fullscreen and windowed mode.
 	 */
 	bool ToggleFullscreen();
Index: source/ps/VideoMode.cpp
===================================================================
--- source/ps/VideoMode.cpp
+++ source/ps/VideoMode.cpp
@@ -400,7 +400,10 @@
 {
 	return SetFullscreen(!m_IsFullscreen);
 }
-
+bool CVideoMode::isInFullscreen()
+{
+	return m_IsFullscreen;
+}
 void CVideoMode::UpdatePosition(int x, int y)
 {
 	if (!m_IsFullscreen)