diff -Nrua old/src/SDL/i_video.c src/src/SDL/i_video.c
--- old/src/SDL/i_video.c	2009-11-09 16:17:21.000000000 +0100
+++ src/src/SDL/i_video.c	2009-11-09 16:17:46.000000000 +0100
@@ -61,6 +61,8 @@
 #include "st_stuff.h"
 #include "lprintf.h"
 
+#define DISABLE_DOUBLEBUFFER
+
 int gl_colorbuffer_bits=16;
 int gl_depthbuffer_bits=16;
 
@@ -642,7 +644,7 @@
     if (use_doublebuffer)
       init_flags = SDL_DOUBLEBUF;
     else
-      init_flags = SDL_SWSURFACE;
+      init_flags = SDL_HWSURFACE;
 #ifndef _DEBUG
     init_flags |= SDL_HWPALETTE;
 #endif