diff --git a/java/com/tigervnc/vncviewer/CConn.java b/java/com/tigervnc/vncviewer/CConn.java
index d9e1682..089d241 100644
--- a/java/com/tigervnc/vncviewer/CConn.java
+++ b/java/com/tigervnc/vncviewer/CConn.java
@@ -104,6 +104,7 @@
 
   public void addChild(DesktopWindow child) {
     sp = new JScrollPane(child);
+    sp.setDoubleBuffered(true);
     child.setBackground(Color.BLACK);
     child.setOpaque(true);
     sp.setBorder(BorderFactory.createEmptyBorder(0,0,0,0));
@@ -699,8 +700,10 @@
       JOptionPane.PLAIN_MESSAGE);
   }
 
-  synchronized public void refresh() {
-    writer().writeFramebufferUpdateRequest(new Rect(0,0,cp.width,cp.height), false);
+  public void refresh() {
+    synchronized (this) {
+      writer().writeFramebufferUpdateRequest(new Rect(0,0,cp.width,cp.height), false);
+    }
     pendingUpdate = true;
   }
 
@@ -1158,7 +1161,7 @@
   }
 
 
-  synchronized public void writePointerEvent(MouseEvent ev) {
+  public void writePointerEvent(MouseEvent ev) {
     if (state() != RFBSTATE_NORMAL) return;
 
     switch (ev.getID()) {
@@ -1172,7 +1175,9 @@
       break;
     }
 
-    writeModifiers(ev.getModifiers() & ~KeyEvent.ALT_MASK & ~KeyEvent.META_MASK);
+    synchronized (this) {
+      writeModifiers(ev.getModifiers() & ~KeyEvent.ALT_MASK & ~KeyEvent.META_MASK);
+    }
 
     if (cp.width != desktop.scaledWidth || 
         cp.height != desktop.scaledHeight) {
@@ -1181,8 +1186,9 @@
       int sy = (desktop.scaleHeightRatio == 1.00) 
         ? ev.getY() : (int)Math.floor(ev.getY()/desktop.scaleHeightRatio);
       ev.translatePoint(sx - ev.getX(), sy - ev.getY());
-      writer().writePointerEvent(new Point(ev.getX(),ev.getY()), buttonMask);
-    } else {
+    }
+    
+    synchronized (this) {
       writer().writePointerEvent(new Point(ev.getX(),ev.getY()), buttonMask);
     }
 
@@ -1212,7 +1218,7 @@
   }
 
 
-  void writeModifiers(int m) {
+  synchronized void writeModifiers(int m) {
     if ((m & Event.SHIFT_MASK) != (pressedModifiers & Event.SHIFT_MASK))
       writeKeyEvent(Keysyms.Shift_L, (m & Event.SHIFT_MASK) != 0);
     if ((m & Event.CTRL_MASK) != (pressedModifiers & Event.CTRL_MASK))
diff --git a/java/com/tigervnc/vncviewer/DesktopWindow.java b/java/com/tigervnc/vncviewer/DesktopWindow.java
index 21e2e8e..8bf718b 100644
--- a/java/com/tigervnc/vncviewer/DesktopWindow.java
+++ b/java/com/tigervnc/vncviewer/DesktopWindow.java
@@ -55,6 +55,7 @@
     cc = cc_;
     setSize(width, height);
     im = new PixelBufferImage(width, height, cc, this);
+    im.image.setAccelerationPriority(1);
 
     cursor = new Cursor();
     cursorBacking = new ManagedPixelBuffer();
@@ -69,7 +70,6 @@
     });
     setFocusTraversalKeysEnabled(false);
     setFocusable(true);
-    setDoubleBuffered(true);
   }
   
   public int width() {
@@ -113,6 +113,7 @@
 
     synchronized(this) {
     if (!cc.viewer.useLocalCursor.getValue()) return;
+    }
 
     hideLocalCursor();
 
@@ -162,7 +163,6 @@
       tk.createImage(bitmap).getScaledInstance(cw,ch,hint);
     softCursor = tk.createCustomCursor(cursorImage,
                   new java.awt.Point(hotspot.x,hotspot.y), "Cursor");
-    }
 
     if (softCursor != null) {
       setCursor(softCursor); 
@@ -206,12 +206,14 @@
   }
 
   // resize() is called when the desktop has changed size
-  synchronized public void resize() {
+  public void resize() {
     int w = cc.cp.width;
     int h = cc.cp.height;
     hideLocalCursor();
     setSize(w, h);
-    im.resize(w, h);
+    synchronized (this) { 
+      im.resize(w, h);
+    }
   }
 
   final void drawInvalidRect() {
@@ -253,29 +255,35 @@
     drawInvalidRect();
   }
 
-  synchronized final public void fillRect(int x, int y, int w, int h, int pix)
+  final public void fillRect(int x, int y, int w, int h, int pix)
   {
     if (overlapsCursor(x, y, w, h)) hideLocalCursor();
-    im.fillRect(x, y, w, h, pix);
+    synchronized (this) { 
+      im.fillRect(x, y, w, h, pix);
+    }
     invalidate(x, y, w, h);
     if (softCursor == null)
       showLocalCursor();
   }
 
-  synchronized final public void imageRect(int x, int y, int w, int h,
+  final public void imageRect(int x, int y, int w, int h,
                                            int[] pix) {
     if (overlapsCursor(x, y, w, h)) hideLocalCursor();
-    im.imageRect(x, y, w, h, pix);
+    synchronized (this) {
+      im.imageRect(x, y, w, h, pix);
+    }
     invalidate(x, y, w, h);
     if (softCursor == null)
       showLocalCursor();
   }
 
-  synchronized final public void copyRect(int x, int y, int w, int h,
+  final public void copyRect(int x, int y, int w, int h,
                                           int srcX, int srcY) {
     if (overlapsCursor(x, y, w, h) || overlapsCursor(srcX, srcY, w, h))
       hideLocalCursor();
-    im.copyRect(x, y, w, h, srcX, srcY);
+    synchronized (this) {
+      im.copyRect(x, y, w, h, srcX, srcY);
+    }
     if (!cc.viewer.fastCopyRect.getValue()) {
       invalidate(x, y, w, h);
     }
@@ -293,7 +301,7 @@
   ////////////////////////////////////////////////////////////////////
   // The following methods are all called from the GUI thread
 
-  synchronized void resetLocalCursor() {
+  void resetLocalCursor() {
     hideLocalCursor();
     cursorAvailable = false;
   }
@@ -350,7 +358,7 @@
     scaleHeightRatio = (float)scaledHeight / (float)cc.cp.height;
   }
 
-  synchronized public void paintComponent(Graphics g) {
+  public void paintComponent(Graphics g) {
     Graphics2D g2 = (Graphics2D) g;
     g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, 
                         RenderingHints.VALUE_INTERPOLATION_BILINEAR);  
@@ -362,7 +370,7 @@
       g2.drawImage(im.image, 0, 0, scaledWidth, scaledHeight, null);  
     }
   }
-
+  
   String oldContents = "";
   
   synchronized public void checkClipboard() {
@@ -395,11 +403,11 @@
     if (!cc.viewer.viewOnly.getValue())
       cc.writePointerEvent(e);
     // - If local cursor rendering is enabled then use it
-    synchronized(this) {
-      if (cursorAvailable) {
-        // - Render the cursor!
-        if (e.getX() != cursorPosX || e.getY() != cursorPosY) {
-          hideLocalCursor();
+    if (cursorAvailable) {
+      // - Render the cursor!
+      if (e.getX() != cursorPosX || e.getY() != cursorPosY) {
+        hideLocalCursor();
+        synchronized(this) {
           if (e.getX() >= 0 && e.getX() < im.width() &&
               e.getY() >= 0 && e.getY() < im.height()) {
             cursorPosX = e.getX();
diff --git a/java/com/tigervnc/vncviewer/PixelBufferImage.java b/java/com/tigervnc/vncviewer/PixelBufferImage.java
index ccac482..bb7e0e4 100644
--- a/java/com/tigervnc/vncviewer/PixelBufferImage.java
+++ b/java/com/tigervnc/vncviewer/PixelBufferImage.java
@@ -103,6 +103,7 @@
   public void put(int x, int y, int w, int h, Graphics g) {
     if (ic != null) {
       ic.setPixels(x, y, w, h, cm, data, width() * y + x, width());
+      g.setClip(x, y, w, h);
       ic.imageComplete(ImageConsumer.SINGLEFRAMEDONE);
     }
   }