Two issues with your code that should significantly speed things up.
First, by calling imshow() each time for the draw, there is significant
overhead caused by this. Instead -- (and this is a huge speedup) -- save
the object returned by the first call to imshow(). That object has a method
".set_array()" that will allow you to just change the data contained within
the AxesImage object. This is *much* faster than calling imshow()
repeatedly. Note that the array going into set_array() will have to be of
the same shape as the original image.
Second, by setting the "interpolation" kwarg to *None*, you are merely
telling imshow() to use the default interpolation specified in your rcParams
file. Instead, you probably want "nearest". Actually, supposedly, the
upcoming release is supposed to support a new value "none" for absolutely no
interpolation at all. The idea would be that one would pre-interpolate the
image data before sending it to imshow() and have imshow set to do no
interpolations at all. Therefore, the images display much faster.
I hope this helps!
Ben Root
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