I am using the AU version of Pro Q-3 on a session in Ableton 10 (as the AU version works with Instance naming, and VST2 doesn't), and I am finding that every time I open Pro Q-3, and add/edit an EQ curve, the spinning wheel appears and stays spinning for 20-30 seconds before I can use Pro Q-3 again. After that it is okay. But if I open a new instance of Pro Q-3 (say on another track), it happens every time.
This is 100% reproducible on my current Ableton project (around 20 audio/midi tracks). I have a new Mac Mini 2018 (Core i7, 32GB Ram, 512GB SSD) running Mojave, so not a slow machine.
Is this a known issue?