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Processing Speed

The processing speed is affected by many factors.  Foremost among these is the FFT size.  Select a lower FFT size for faster performance but with reduced frequency resolution.  
Video speed is major factor.  The more views that are displayed, the greater the demands placed on the video subsystem.  The Spectrum plot is the fastest.

The 3-D Surface and Spectrogram views are significantly slower than the Time Series or Spectrum views.  You may want to close these views if you are not using them.  Alternatively they will run slightly faster if minimized to an icon along the bottom of the display.
If only the Time Series plot is active, the system will not perform an FFT and will function much like a digital storage scope

See also:  FFT size, Settings