Change of HomeKit-Item leeds to very slow update in Home-App?

My openhab installation is on the latest snapshot and I have the lastest iOS 11.
Everything worked nice and fast until I needed to change and add items to homekit.
Since then the installation still works but after opening the Home-App it takes very long until I get the actual status and I need to switch pages in the Home-App (eg. Home - Rooms …) to get to that.

Any ideas what causes this delays and how to solve that?

@LuFriFri have you found out anything more yet ?

Sorry, no, I deleted and redid the complete setup on iOS and reseted homekit in openhab