I have exactly the same setup (except I’m still on 2023.5.2) und have the same problem.
The web interface on a computer is super fast. But the app is so slow and crashes a lot.
I have exactly the same problem since some time. Now on the lastest stable version 2023.5.3 and iPhone 13 Pro and have to click a few times on the menu buttons in the app to get a response.
Have any of you force closed the app and cleared the cache (I’m on Android, so not sure what the iOS equivalents are called). I find that my app slows down every now and then (especially the case if I look at a lot of detailed graphs). This has always fixed the issue for me.
I additionally removed the server, deleted the app again, reinstalled it and added the server via ip directly (not homeassistant:8123)
For now it’s running smooth and without and freezes/crashes.
Maybe we can find things out Systems have in common.
I’m running it on a raspberry pi 4. I have a lot of dashboards and quite a lot of sensors. Maybe too many for a small raspberry. Processor load is around 12% and going up so 40 every 20-30 seconds. Couldn’t find out why. But maybe that’s also the issue
I think I „solved“ it. Changed to a ssd and restored from a full backup. Now everything is running smooth again. Not sure if it is the change to ssd or the new Installation an backup restore though.
My cpu load is so much lower now.