ple processing like blending a lot.
  So typically processing of small bitmaps or small areas in bitmaps will 
  benefit mostly from optimizations in which a call to EMMS costs less or is
  even entirely omitted.</p> 
<p class="Body">Unfortunately for sake of backward compatibility it was not 
  possible to switch entirely to SSE2, as there are still many old machines 
  without SSE2, that still benefit from the MMX optimizations. Thus, the 
  existing infrastructure was used, but the EMMS call replaced by 