Index: libvo/vo_direct3d.c
===================================================================
--- libvo/vo_direct3d.c	(revision 28117)
+++ libvo/vo_direct3d.c	(working copy)
@@ -73,8 +73,19 @@
                                     priv->movie_src_fmt */
     IDirect3DSurface9 *d3d_backbuf; /**< Video card's back buffer (used to
                                     display next frame) */
+    int last_resize_ms;             /**< Milliseconds at which the last resize
+                                         event occured. 0 if none. */
 } *priv;
 
+/* Don't recreate the rendering context immediately after a resize event, but
+   wait exactly VO_DIRECT3D_RESIZE_PERIOD milliseconds from the last resize
+   event. A new resize event before this this time has elapsed, resets the timer
+   for another VO_DIRECT3D_RESIZE_PERIOD milliseconds. Reason: recreating
+   the rendering context many times per second  is quite expensive and we
+   should delay it until the window is not resized anymore. */
+
+#define VO_DIRECT3D_RESIZE_PERIOD 100
+
 typedef struct {
     const unsigned int  mplayer_fmt;   /**< Given by MPlayer */
     const D3DFORMAT     fourcc;        /**< Required by D3D's test function */
@@ -387,6 +398,15 @@
      * if (mpi->flags & MP_IMGFLAG_DIRECT) ...
      */
 
+    /* Check for a delayed resize event */
+    if (WinID >=0 && priv->last_resize_ms)
+    {
+        if (GetTickCount() - priv->last_resize_ms > VO_DIRECT3D_RESIZE_PERIOD) {
+            resize_d3d();
+            priv->last_resize_ms = 0;
+        }
+    }
+
     if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK)
         goto skip_upload;
 
@@ -432,7 +452,7 @@
                                             priv->d3d_backbuf,
                                             &priv->fs_movie_rect,
                                             D3DTEXF_LINEAR))) {
-        mp_msg(MSGT_VO, MSGL_ERR,
+        mp_msg(MSGT_VO, MSGL_V,
                "<vo_direct3d>Unable to copy the frame to the back buffer\n");
         return VO_ERROR;
     }
@@ -696,8 +716,15 @@
      * with the new window width/height.
      */
     flags = vo_w32_check_events();
-    if (flags & VO_EVENT_RESIZE)
-        resize_d3d();
+    if (flags & VO_EVENT_RESIZE) {
+       /* Schedule a resize by saving current milliseconds. A real resize will be
+       performed when no new resize have been scheduled for at least
+       VO_DIRECT3D_RESIZE_PERIOD given in milliseconds. Valid for slave mode only. */
+        if (WinID >= 0)
+            priv->last_resize_ms = GetTickCount();
+        else
+            resize_d3d();
+    }
 
     if ((flags & VO_EVENT_EXPOSE) && priv->is_paused)
         flip_page();