> The image that runs forever is 40346 rows by 6144 columns.

Most likely ImageMagick is caching your image to disk.  It will
eventually complete but disk I/O is 1000 times slower than memory.
See http://www.imagemagick.org/script/architecture.php for a discussion
of the pixel cache.  You may get better performance from a Q8 version
of ImageMagick.  The default version is Q16.
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