When pup starts, it can be long wait before it shows a window.  The first time I
ran it, I thought it was broken.  Netstat shows http connections being made so
presumably it is updating the yum cache.  On later runs, it starts quickly
because  the cache is up-to-date.

Pup should show something, preferably with a progress window, while it does the
yum metadata refresh.  Otherwise, it looks like it is broken or really slow.