Allright, now a have some good news (for you) and bad news (for me). As I wrote yesterday, I still got the lag and beachball – on my iMac Pro (which I thought was supposed to be a good machine) – but it works normally when trying the same thing on my little MacBook Pro. The fans are spinning like crazy when I start IPR though, so perhaps not everything is quite optimised yet (or my MacBook isn’t powerful enough)…?
I wonder what’s wrong with my main (desktop) computer… Do you have any guesses or suggestions, or should I just reinstall the operating system? This iMac is about 18 months old already, so I guess I could try that if nothing else helps.