diff --git a/ChangeLog b/ChangeLog
index efc4e20657..0a5077bca0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-12-30  Sven Neumann  <sven@gimp.org>
+
+	* app/display/gimpstatusbar.[ch]
+	* app/widgets/gimpprogressbox.[ch]: only update the GtkProgressBar
+	if that would cause a visible change.
+
 2007-12-30  Manish Singh  <yosh@gimp.org>
 
 	* plug-ins/pygimp/pygimp-tile.c: subscript API for PixelFetcher.
diff --git a/app/display/gimpstatusbar.c b/app/display/gimpstatusbar.c
index c3a5ddbec1..76047cfcce 100644
--- a/app/display/gimpstatusbar.c
+++ b/app/display/gimpstatusbar.c
@@ -281,6 +281,7 @@ gimp_statusbar_progress_start (GimpProgress *progress,
         gtk_widget_show (statusbar->cancel_button);
 
       statusbar->progress_active = TRUE;
+      statusbar->progress_value  = 0.0;
 
       if (! GTK_WIDGET_VISIBLE (statusbar))
         {
@@ -313,6 +314,7 @@ gimp_statusbar_progress_end (GimpProgress *progress)
         }
 
       statusbar->progress_active = FALSE;
+      statusbar->progress_value  = 0.0;
 
       gimp_statusbar_pop (statusbar, "progress");
       gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (bar), 0.0);
@@ -356,10 +358,18 @@ gimp_statusbar_progress_set_value (GimpProgress *progress,
     {
       GtkWidget *bar = statusbar->progressbar;
 
-      gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (bar), percentage);
+      statusbar->progress_value = percentage;
 
-      if (GTK_WIDGET_DRAWABLE (bar))
-        gdk_window_process_updates (bar->window, TRUE);
+      /* only update the progress bar if this causes a visible change */
+      if (fabs (bar->allocation.width *
+                (percentage -
+                 gtk_progress_bar_get_fraction (GTK_PROGRESS_BAR (bar)))) > 1.0)
+        {
+          gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (bar), percentage);
+
+          if (GTK_WIDGET_DRAWABLE (bar))
+            gdk_window_process_updates (bar->window, TRUE);
+        }
     }
 }
 
@@ -370,9 +380,7 @@ gimp_statusbar_progress_get_value (GimpProgress *progress)
 
   if (statusbar->progress_active)
     {
-      GtkWidget *bar = statusbar->progressbar;
-
-      return gtk_progress_bar_get_fraction (GTK_PROGRESS_BAR (bar));
+      return statusbar->progress_value;
     }
 
   return 0.0;
diff --git a/app/display/gimpstatusbar.h b/app/display/gimpstatusbar.h
index 8fdef85e27..e6a00312e1 100644
--- a/app/display/gimpstatusbar.h
+++ b/app/display/gimpstatusbar.h
@@ -62,6 +62,7 @@ struct _GimpStatusbar
   GtkWidget        *cancel_button;
   gboolean          progress_active;
   gboolean          progress_shown;
+  gdouble           progress_value;
 };
 
 struct _GimpStatusbarClass
diff --git a/app/widgets/gimpprogressbox.c b/app/widgets/gimpprogressbox.c
index 0738477af3..31a4af53f3 100644
--- a/app/widgets/gimpprogressbox.c
+++ b/app/widgets/gimpprogressbox.c
@@ -23,6 +23,7 @@
 
 #include <gtk/gtk.h>
 
+#include "libgimpmath/gimpmath.h"
 #include "libgimpwidgets/gimpwidgets.h"
 
 #include "widgets-types.h"
@@ -108,6 +109,7 @@ gimp_progress_box_progress_start (GimpProgress *progress,
 
       box->active     = TRUE;
       box->cancelable = cancelable;
+      box->value      = 0.0;
 
       if (GTK_WIDGET_DRAWABLE (box->progress))
         gdk_window_process_updates (box->progress->window, TRUE);
@@ -132,6 +134,7 @@ gimp_progress_box_progress_end (GimpProgress *progress)
 
       box->active     = FALSE;
       box->cancelable = FALSE;
+      box->value      = 0.0;
     }
 }
 
@@ -168,10 +171,17 @@ gimp_progress_box_progress_set_value (GimpProgress *progress,
     {
       GtkProgressBar *bar = GTK_PROGRESS_BAR (box->progress);
 
-      gtk_progress_bar_set_fraction (bar, percentage);
+      box->value = percentage;
 
-      if (GTK_WIDGET_DRAWABLE (box->progress))
-        gdk_window_process_updates (box->progress->window, TRUE);
+      /* only update the progress bar if this causes a visible change */
+      if (fabs (GTK_WIDGET (bar)->allocation.width *
+                (percentage - gtk_progress_bar_get_fraction (bar))) > 1.0)
+        {
+          gtk_progress_bar_set_fraction (bar, box->value);
+
+          if (GTK_WIDGET_DRAWABLE (box->progress))
+            gdk_window_process_updates (box->progress->window, TRUE);
+        }
     }
 }
 
@@ -181,11 +191,7 @@ gimp_progress_box_progress_get_value (GimpProgress *progress)
   GimpProgressBox *box = GIMP_PROGRESS_BOX (progress);
 
   if (box->active)
-    {
-      GtkProgressBar *bar = GTK_PROGRESS_BAR (box->progress);
-
-      return gtk_progress_bar_get_fraction (bar);
-    }
+    return box->value;
 
   return 0.0;
 }
diff --git a/app/widgets/gimpprogressbox.h b/app/widgets/gimpprogressbox.h
index 646f56ed14..64cf5d9846 100644
--- a/app/widgets/gimpprogressbox.h
+++ b/app/widgets/gimpprogressbox.h
@@ -43,6 +43,7 @@ struct _GimpProgressBox
 
   gboolean    active;
   gboolean    cancelable;
+  gdouble     value;
 
   GtkWidget  *label;
   GtkWidget  *progress;