Illustrator CC 2017 on imac retina 5k, 27", 2017 is now running as fast as it did as Illustrator CC 2014 on imac 27", mid 2010, both with 16gb ram. It changed from that astonishingly slow condition after i set main monitor and second monitor to resolutions that apparently work well together... default resolution on both... "Default for display". ... just remembered i had to also change the retina display to low resolution... "2560 x 1440 (low resolution). Adobe: yes you have a virtual monopoly on graphics software.
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