@herf I use a MacBook Pro (Retina, 15-inch, Mid 2014) and it doesn't have this f.lux Profile present in Displays > Color. There are a bunch of others there, however, presumably installed by default by macOS.
Interestingly, when I change to any of the Color Profiles in that list, the system does hang for a few seconds, just like when f.lux changes the color temperature.
Since I don't have a f.lux Profile in there, however, should I still try any of the suggestions in that article that you linked to?
Thanks,
John