Java Efficiency: Fullscreen Exclusive Mode

Question

Recently I came across the fullscreen exclusive mode for Java. As I tried it myself, I encountered something: Rendering the exactly same content in a JFrame or Frame in fullscreen mode takes significantly longer (40 fps), than in an undecorated and maximized window (150-200 fps). My screen is set to 50 fps, that's 20ms per frame and I can't see, where this time is lost. My only idea is, that Jave - for some reason - decides to use my onboard graphicscard while in fullscreen.

GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
if(gd.isFullScreenSupported()) {
    try {
        gd.setFullScreenWindow(window);
    } finally {
        gd.setFullScreenWindow(null);
    }
} else {
    this.fullscreen = false;
}

I manage repainting with a frame, that trys to hold the frame rate on a certain level by pausing a calculated time.

int delta = (int) (System.currentTimeMillis() - timestamp); //timestamp: start of this round
if(animated - delta > 0)
    pause(animated - delta);

And finally I draw on the frame using double buffering:

public void render(Graphics2D a) { //window graphics are passed
    Graphics2D g = (Graphics2D) backBuffer.getGraphics();
    //Adjusting some rendering hints here...
    //Then drawing some stuff...
    g.dispose();
    a.drawImage(backBuffer, 0, 0, null);
}

That's basically it, and still: the so-called efficient fullscreen mode is damn slow.

Answer 1

Try setting the system property -Dsun.java2d.d3d=false as suggested here Why does my Java application run so slowly in full-screen mode? (and fine when windowed)