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Index: gtk/gtkrange.c
===================================================================
--- gtk/gtkrange.c	(revision 18523)
+++ gtk/gtkrange.c	(working copy)
@@ -99,6 +99,8 @@
 
   GtkSensitivityType lower_sensitivity;
   GtkSensitivityType upper_sensitivity;
+
+  guint motion_idle;
 };
 
 
@@ -1721,6 +1723,16 @@
                  &handled);
 }
 
+static gboolean
+update_slider_position_idle (GtkRange *range)
+{
+  update_slider_position (range, range->layout->mouse_x,range->layout->mouse_y); 
+
+  range->layout->motion_idle = 0;
+
+  return FALSE;
+}
+
 static void 
 stop_scrolling (GtkRange *range)
 {
@@ -1860,8 +1872,8 @@
   if (gtk_range_update_mouse_location (range))
     gtk_widget_queue_draw (widget);
 
-  if (range->layout->grab_location == MOUSE_SLIDER)
-    update_slider_position (range, x, y);
+  if (range->layout->grab_location == MOUSE_SLIDER && !range->layout->motion_idle)
+    range->layout->motion_idle = g_idle_add ((GSourceFunc)update_slider_position_idle, range);
 
   /* We handled the event if the mouse was in the range_rect */
   return range->layout->mouse_location != MOUSE_OUTSIDE;