Graphics overlay jlabel image Icon

Question

I'm doing a game in java, and my problem is setting the background. I've tried using g.drawImage() but as its repaints every time, cause fps to drop a lot. So i fixed this fps issue by setting background with JLabel and ImageIcon. But the label overlay the graphics, how can I fix this?

public class GameScreen extends Screen implements Observer {

private static GameScreen gamescreen;
private Game game;
private JLabel label = new JLabel();
private ImageIcon icon = new ImageIcon("./res/img/bg1.png");

private GameScreen() {
    setGame(Game.getInstance());

    setLayout(null);
    label.setIcon(icon);
    label.setBounds(0, 0, 600, 600);
    
    add(label);
}

public static GameScreen getInstance() {
    if(getGameScreen() == null) {
        setGameScreen(new GameScreen());
    }
    return getGameScreen();
}

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    
    //PaintWorld
    new DrawableWorld().draw(g, getWidth(), getHeight());
    //Paint players
    new DrawablePlayer().draw(g, getWidth(), getHeight(), getGame().getPlayers());
    //Paint hud
    new DrawableHud().draw(g, getWidth(), getGame().getPlayers());
}

@Override
public void update(Observable o, Object arg) {
    repaint();
}
//getters & setters..

Example:

PS: All DrawableClasses extends Screen that extends JPanel

Answer 1

Following @serg.nechaev answer.

    public class GameScreen extends Screen implements Observer {

private static GameScreen gamescreen;
private Game game;
//New static vars
private static BufferedImage image;
private static Image img;
private static int w = 0;
private static int h = 0;

private GameScreen() {
    setGame(Game.getInstance());
    setImage();
}

public static GameScreen getInstance() {
    if(getGameScreen() == null) {
        setGameScreen(new GameScreen());
    }
    return getGameScreen();
}

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    //Scaling once
    if(w != getWidth() || h != getHeight()) {
        img = getImage().getScaledInstance(getWidth(), getHeight(), Image.SCALE_SMOOTH);
        w = getWidth();
        h = getHeight();    
    }
    else{
        g.drawImage(getImg(), 0, 0, this);  
    }

    //PaintWorld
    new DrawableWorld().draw(g, getWidth(), getHeight());
    //Paint players
    new DrawablePlayer().draw(g, getWidth(), getHeight(), getGame().getPlayers());
    //Paint hud
    new DrawableHud().draw(g, getWidth(), getGame().getPlayers());
}

@Override
public void update(Observable o, Object arg) {
    repaint();
}
//getters & setters..
    public BufferedImage getImage() {
    return image;
}

public void setImage() {
    try {
        GameScreen.image = ImageIO.read(new File("./res/img/bg1.png"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

public Image getImg() {
    return GameScreen.img;
}

Result with good fps:

Answer 2

g.drawImage is a very fast (to an extent) operation. Do you scale the image while drawing? Do you use "maximum quality" rendering hints?