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  How can I speed up `canvas` performance?
 
 Often times coding style changes can result in increased performance,
but the `canvas` has its limits.  The Tk dash patch
(http://home.wxs.nl/~nijtmans/dash.html) by Jan Nijtmans
(mailto:nijtmans@wxs.nl) has many canvas improvements, including one or
two that can improve performance in some situations.