Peter Ronnquist wrote:
> Some clarification, the behavior I get is that the
> animation is not smooth. It is like the vetical
> retrace is missed sometimes.
> It could be that it do the flip at the correcttime,
> but that the loop sometimes takes too long so that one
> vertical retrace is skipped.

Here are some tips about how to make it faster:

* Use Sdlvideo.surface_display_format to convert the
  image to faster format
* Set the color depth to the depth of your screen
* When using Sdlvideo.update_rect, Sdlvideo.flip is unnecessary.
  I don't know if update_rect waits for vertical retrace.
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