Thanks for your thoughts.
Just to make a less subjective comparison, I downloaded the same book to the old Win7 dual core, 4 GB RAM, and to my new 8.1 quadcore, 8 GB RAM. The conversion took 29 seconds on the Win7 and 112 seconds on the 8.1. (Same version of Calibre on both)
I'm not sure what to tame, but it's obvious a setting or two needs tweaking.
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