Can you still use HLO without an internet connection, and logging in/out is simply the way of 'activating/deactivating' your license, basically? And is there caching, or is it like Google Docs, where you can't make changes when the connection is bad?
Edit: Okay, so apparently offline-mode is on the roadmap and as planned right now will not support edit-mode:
"Offline View (Read-only. You will not be able to make changes, modifications, or adjustments to your character in this mode"
And I found a topic with people complaining about the responsiveness, and they replied that they're working on it over time.