title: SDL : blitting time optimization
body: <p>I'm using SDL in windowed mode.</p>
  
  <p>Given a large sprite, say 1024 x 640, is it faster to blit the entire image into severals small tiles, say 32 x 32 px, than to blit the whole image at once ?</p>
  
  <p>I have to blit a background on the screen (1024 * 640) in windowed mode @ 30 FPS (at least). I think that double buffering and hardware surface cannot be used when windowed... For now, I blit the whole sprite at once, but the CPU consumption seems to be very high for a simple background blitting.</p>