Yes, this is consistent with my issue description as well.
There is some large seconds gap/hang happening when reentering the app and this is after the usual load 1/2 seconds time.
I thought it could be the "Reduce Motion as ON" option because it deals with iPhone Animations/Views but no luck there.
This is mostly an issue with UI thread locking up for an extra long job that should be forked off to background handling.
Very frustrating! The new UI is great and a long time coming, now we really need it to work! PLEASE!