There it is.
I try to use PM6 this morning in my normal workflow on a MacPro 3,1 under Mojave which was working perfectly under PM5. I had to stop and move back to PM5 after just 5 minutes : completely unusable, three seconds between two clicks moving from one pix to the next, applying crops etc..........Complete mess, sorry Kirk, I thing beta testing was not well done !!!!!!!! I have seen other posts about this problem and I just discovered they were TRUE on my system. I have not tried it on my MacBook Pro but I am now reluctant to test it after the bad experience of this morning..........