How long does it take to process on your PC?
A few minutes here, so quick iteration is impossible.
Well that's the interesting/strange thing, which I was just going to post about...
On my work laptop (2015 MacBook Pro), it takes a few minutes. On my personal laptop (older HP EliteBook with a Sandy Bridge CPU), it doesn't seem to work at all (crunches for a minute or two, then stops without displaying anything). On my home desktop (AMD FX-8350), it takes about 5 seconds