What makes you think this? Do you see the spinning beach ball a lot?
I searched in our crash database for a crash posted by the e-mail you are using on this forum, but couldn’t find one. Next time, please fill in an e-mail address so we can see what the issue you are running to is.
Crashes / hanging on reading ‘photos’ takes ages then often crashes. Activity monitor shows almost no CPU movement, disk i/o or RAM usage at same time.
We get a very long delay when first opening the Media window after starting the app, but after that it remains pretty snappy for us. Definitely not experiencing the spinning beach ball of delay overall as much as was with GS6.