Re: ImageMagick hangs on Windows when converting large PDF to PNG

> see in the process list in task manager, convert.exe, is taking large
> amounts of CPU time/memory initially, then "slowing down"

See http://www.imagemagick.org/script/architecture.php#cache.  Your
images are cached to disk and disk is 1000 times slower than memory.
The task will complete as long as you have plenty of temporary disk space
available.  For large conversions we recommend caching all images to disk
to reduce memory consumption and possible thrashing of memory / swap.
Add -limit area 0 to your command line.

If you only need a page or two from your large PDF, you can reduce run-time
by specifying which pages you need:

  convert image.pdf[0] image.jpg