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See also: https://bugs.python.org/issue34014
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want for the render function of the prompt_toolkit UI. Rendering is
expensive, but since the UI is invalidated very often, in some situations
we render the UI too often, so much that the rendering CPU usage slows down
the rest of the processing of the application. (Pymux is an example where
we have to balance the CPU time spend on rendering the UI, and parsing
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