I have the same issue. I don't understand how this is supposed to work, but from the app the "dashboards" are accessed through the cloud, they take 3-4 seconds to load.
When I go to "Tool>Connect to a hub" it connects locally (using the IP address). It opens a safari browser instance, where dashboard loads or any other page loads are instant, super quick.
I click "done" and it closes Safari and returns me to the app, where the dashboard loads slowly again (using cloud.hubitat.com/api/xxxxx where xxxxx is a different dashboard).
Surely this is an error? Why does the app not use the local IP and instead use the cloud address?
How can I change this behaviour to default to the IP and not cloud connection?
In any case, I just bought another Hub (Have a C5 bought a Black Friday C7) to support this project. Order a bunch of Lifx bulbs which I am looking forward to setting up. Finally retired my Homey Pro last week.