I have a 12 Core 2.7 GHz Mac Pro (2013). The software is unacceptably slow with our without GPU acceleration (without is worse). It runs fine on my new (2018) 2.9 GHz MacBook pro. I'm sure that this is related to the GPU on the older machine. That said, the rest of CC runs fine (including photoshop, premiere and aftereffects). This bug is new to illustrator 23 which was (if we're honest) a very modest update to the application's functionality.
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