NAVIGON App reacts slowly after update on iOS11
You have a NAVIGON app (e.g. Europe, DACH, etc.) and recognize that the app reacts slowly after the update on iOS11.
In this case we suggest to deactivate the iCloud function and save the favorites on your iPhone. To do this go into Main menu > General > Use iCloud and select "No".
This problem will be solved with the next update.