Terrible performance of applet with firefox & appletviewer (not IE)

Question

I'm working on a worm game with the help of a book on the subject. It's not finished yet, the worm can only move around & stop when hitting a wall. Now as I add the g.drawImage(blahblah) to the paint-method, the performance gets terrible, the mouse responds every 2 seconds and painting errors occur in the applet. I can barely manage to get the appletviewer closed.. The weird thing is, that the applet works smooth on IE, but not on firefox nor appletviewer... Here's the code, "translated" to english with find & replace for your convenience. The worm.java -file is not included, only the main wormgame.java
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class wormgame extends Applet implements Runnable
     Thread Thrd;
     worm Worm;
     Image Background;
     boolean Loaded;
     public void init()
          Worm = new worm(27, 1, 3);
          Background = getImage(getCodeBase(), "tausta.jpg");
          Image ImageToMemory = createImage(size().width, size().height);
          Graphics ImageToMemoryKP = ImageToMemory.getGraphics();
          ImageToMemoryKP.drawImage(Background, 0, 0, this);
          Loaded = false;
          addKeyListener(new WormListener());
     public boolean imageUpdate(Image img, int infoflags, int x, int y, int w, int h)
          if(infoflags == ALLBITS)
               Loaded = true;
               repaint();
               return false;
          return true;
     public void update(Graphics g)
          paint(g);
     public void start()
          if(Thrd == null)
               Thrd = new Thread(this);
               Thrd.start();
          requestFocus();
     public void run()
          while(true)
               Worm.move();
               if(Worm.isDead())
                    Thrd.suspend();
               repaint();
               synchronized(this)
                    try
                         wait(200);
                    catch(InterruptedException e)
     public void paint (Graphics g)
          if(Loaded)
               g.drawImage(Background, 0, 0, this);
               showStatus("Finished.");
          else
               showStatus("Loading gfx...");
          Worm.piirraWorm(g);
          requestFocus();
     class WormListener extends KeyAdapter
          public void keyPressed(KeyEvent e)
               switch(e.getKeyCode())
                    case KeyEvent.VK_LEFT:
                    if(Worm.parts[0].direction !=Worm.RIGHT)
                         Worm.turn(Worm.LEFT);
                         repaint();
                    break;
                    case KeyEvent.VK_RIGHT:
                    if(Worm.parts[0].direction !=Worm.LEFT)
                         Worm.turn(Worm.RIGHT);
                         repaint();
                    break;
                    case KeyEvent.VK_UP:
                    if(Worm.parts[0].direction !=Worm.DOWN)
                         Worm.turn(Worm.UP);
                         repaint();
                    break;
                    case KeyEvent.VK_DOWN:
                    if(Worm.parts[0].direction !=Worm.UP)
                         Worm.turn(Worm.DOWN);
                         repaint();
                    break;
     }

Answer 1

Just noticed that it won't work with IE either anymore.. My friend got it working, sounds like there's sth matter with my system? I have the latest jre & jdk, just reinstalled them due to this (didn't help).. here's the address for the applet: http://acdx.net/matopeli/matopeli.htm