Blender 2.5 alpha, slow screen update

Now that I got Blender 2.5 alpha 0 running on my old laptop, I noticed that when rotating what must be the most deleted cube in the 3D world, the refresh rate was very slow. An update rate of 2 or 3 times per second makes the program unusable.

Granted, the laptop is not very fast, but in the old version of Blender (2.49a) the cube followed the mouse movement without any visible delay.

Having seen Blender using OpenGL without hardware acceleration before, I tried pressing one of the OpenGL buttons down in the "header" of the 3D window:

This produced the error: "Failed to create OpenGL offscreen buffer".

Something was wrong with the use of OpenGL.

User teeth in the developer IRC channel #blendercoders on freenet.org, suggested to change the user preferences from "Triple Buffer" to "Overlap".

You can display these settings using "File - User Preferences" or Ctrl-Alt-U. Then select "System" and look for the "Window draw method".

Don't forget to "Save as default".

It worked here. If you have the same problem, it's worth a try.