I've been a somewhat happy user for about 10 years and this is my first big disappointment - just upgraded to 21 (14.02) and started to work with images. Unfortunately it seems that cropping (and rotating) are almost unusably slow. No idea why this is - I'm using a small catalogue, I tried with and without Hardware Acceleration, never saw anything like this in v20. I'm running a 2019 MBP with 32G RAM so I don't think my computer should be a limiting factor - I certainly don't expect to see beachballing when I'm cropping.
I wonder if anyone with inside info knows if this is a problem recognised by CO ?