The RhinoCycles.UseFastDraw setting is only for Raytraced. It fades the Raytraced results gradually in, giving some sense of smoothness. For further manipulation smoothness in Raytraced you can still set the advanced option RhinoCycles.UseStartResolution. None of these specially take any control device input into account, Raytraced doesn’t. It depends on what Rhino tells it what the new viewport settings are.
The throttling is meant to give processor time to the operating system wirh Raytraced active, nothing else.