diff --git a/core/src/processing/awt/PSurfaceAWT.java b/core/src/processing/awt/PSurfaceAWT.java
index 27c7b8e6be..a0d4cdefce 100644
--- a/core/src/processing/awt/PSurfaceAWT.java
+++ b/core/src/processing/awt/PSurfaceAWT.java
@@ -90,7 +90,7 @@ public class PSurfaceAWT extends PSurfaceNone {
   int sketchWidth;
   int sketchHeight;
 
-  int windowScaleFactor;
+  int windowScaleFactor = 1;
 
 
   public PSurfaceAWT(PGraphics graphics) {
@@ -228,7 +228,8 @@ public void validate() {
         oldSize = newSize;
         sketch.setSize(newSize.width / windowScaleFactor, newSize.height / windowScaleFactor);
 //        try {
-        render();
+        // DANILO TOMASONI: removed render here, it will be handled only by animation thread
+        //render();
 //        } catch (IllegalStateException ise) {
 //          System.out.println(ise.getMessage());
 //        }
@@ -247,7 +248,8 @@ public void update(Graphics g) {
     public void paint(Graphics screen) {
 //      System.out.println("painting");
 //      if (useStrategy) {
-      render();
+      // DANILO TOMASONI: removed render here, it will be handled only by animation thread
+      //render();
       /*
       if (graphics != null) {
         System.out.println("drawing to screen " + canvas);
@@ -281,7 +283,7 @@ public void addNotify() {
     */
 
 
-  synchronized protected void render() {
+  protected void render() {
     if (canvas.isDisplayable() &&
         graphics.image != null) {
       if (canvas.getBufferStrategy() == null) {