Java er meget langsom i mit Graphics2D object

import java.awt.Color;
import javax.swing.*;

import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Graphics;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;

public class XGameFrame extends JFrame{
   
    private static final long serialVersionUID = 1L;
    private Image img;
    private BufferedImage bi;
    private double lx;
    private double ly;
    private double dx;
    private double dy;
    GraphicsDevice gd;
    fps fps;
   
    public XGameFrame(){
        fps = new fps();
        this.gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
        this.setUndecorated(true);
        gd.setFullScreenWindow(this);
        this.loadImages();
        bi = new BufferedImage(this.getWidth(),this.getHeight(),BufferedImage.TYPE_4BYTE_ABGR);
        this.lx = 0;
        this.ly = 0;
        this.dx = 1;
        this.dy = 2;
    }
   
    public Graphics2D getGraphics2D(){
        return (Graphics2D)this.getGraphics();
    }
   
    public void loadImages(){
        this.img = Toolkit.getDefaultToolkit().createImage(getClass().getResource("logo.gif"));
    }
   
    @Override
    public void paint(Graphics g){
        this.fps.tick();
        Graphics2D g2 = this.getGraphics2D();
        Graphics2D big = (Graphics2D)this.bi.getGraphics();
        big.setColor(Color.black);
        big.fillRect(0, 0, this.getWidth(), this.getHeight());
       
        if(this.dy + this.ly < 0){
            this.dy = Math.abs(this.dy);
        }
        else if(this.dy + this.ly + (this.img.getHeight(getOwner())*0.4) > this.getHeight()){
            this.dy = -(this.dy);
        }
       
        if(this.dx + this.lx < 0){
            this.dx = Math.abs(this.dx);
        }
        else if(this.dx + this.lx + (this.img.getWidth(getOwner())*0.4)-50 > this.getWidth()){
            this.dx = -(this.dx);
        }
       
        this.ly = this.ly + this.dy;
        this.lx = this.lx + this.dx;
       
        big.drawImage(this.img, (int)lx, (int)ly, (int)(this.img.getWidth(getOwner())*0.4), (int)(this.img.getHeight(getOwner())*0.4), null);
        big.setFont(new Font(Font.MONOSPACED,Font.PLAIN,12));
        big.setColor(Color.red);
        big.drawString("FPS: "+(int)fps.getFPS(),20,20);
        g2.drawImage(this.bi, null, 0, 0);
    }
}