diff --git a/composite.cpp b/composite.cpp
index bc0f40e45d..6d4e9236f2 100644
--- a/composite.cpp
+++ b/composite.cpp
@@ -52,13 +52,34 @@ void Workspace::setDamaged()
     
 void Workspace::compositeTimeout()
     {
+#define EFF
+#ifdef EFF
+    const int SPD = 10;
+    static int cnt = 0;
+    int olds = cnt / SPD;
+    ++cnt;
+    if( cnt == 8 * SPD )
+        cnt = 0;
+    int s = cnt / SPD;
+    if( !damaged && s == olds )
+        return;
+#else
     if( !damaged )
         return;
+#endif
     XGCValues val;
     val.foreground = WhitePixel( display(), DefaultScreen( display()));
     val.subwindow_mode = IncludeInferiors;
     GC gc = XCreateGC( display(), composite_pixmap, GCForeground | GCSubwindowMode, &val );
     XFillRectangle( display(), composite_pixmap, gc, 0, 0, displayWidth(), displayHeight());
+#ifdef EFF
+    val.fill_style = FillStippled;
+    char data[] = { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x00 };
+    data[ s ] = 1 << s;
+    val.stipple = XCreateBitmapFromData( display(), rootWindow(), data, 8, 8 );
+    val.foreground = BlackPixel( display(), DefaultScreen( display()));
+    GC gc2 = XCreateGC( display(), composite_pixmap, GCForeground | GCSubwindowMode | GCFillStyle | GCStipple, &val );
+#endif
     for( ClientList::ConstIterator it = stackingOrder().begin();
          it != stackingOrder().end();
          ++it )
@@ -68,6 +89,9 @@ void Workspace::compositeTimeout()
             {
             XCopyArea( display(), (*it)->windowPixmap(), composite_pixmap, gc,
                 qMax( 0, -(*it)->x()), qMax( 0, -(*it)->y()), r.width(), r.height(), r.x(), r.y());
+#ifdef EFF
+            XFillRectangle( display(), composite_pixmap, gc2, r.x(), r.y(), r.width(), r.height());
+#endif
             }
         }
     for( UnmanagedList::ConstIterator it = unmanaged.begin();
@@ -80,6 +104,10 @@ void Workspace::compositeTimeout()
                 qMax( 0, -(*it)->x()), qMax( 0, -(*it)->y()), r.width(), r.height(), r.x(), r.y());
         }
     XCopyArea( display(), composite_pixmap, rootWindow(), gc, 0, 0, displayWidth(), displayHeight(), 0, 0 );
+#ifdef EFF
+    XFreePixmap( display(), val.stipple );
+    XFreeGC( display(), gc2 );
+#endif
     XFreeGC( display(), gc );
     XFlush( display());
     damaged = false;