New with version 2.02 of Dragon NaturallySpeaking is native support for MMX processors.  This means that Dragon NaturallySpeaking will look for an MMX capable processor, and use MMX specific instructions to improve performance if such a processor is found. 

Dragon NaturallySpeaking does not require an MMX processor; however, if you have such a processor than Dragon NaturallySpeaking should actually run between 5 and 10 percent faster.
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