Sadly, as Gary commented above, no change whatsoever.
Both the machines are comparable, one an iMac, the other a MBP. Both similar setups.
To preview this page: http://pedalpower.caffeineinjection.com/workshop/
iMac 31sec. MBP 33sec.
I wouldn’t consider that an overly complex page.
The MBP is virgin. Fresh install of Sierra today, only apps other than stock are Chrome, Dropbox and RW.
Oh well, worth a try. I’ll wait in hope that RW8 speeds preview up. Least I have got one machine upgraded to Sierra. Now to try and get CS5 to work on it, or else it’s time to get handy with Infinity.