Handling large text messages seems to be extremely slow. What's worse is that loading is uninterruptible. I have a 3.5 MB text message that is now loading for 45 minutes, and I doubt it will ever finish loading. Stopping the application and even rebooting does not help, the application comes up again "Loading message ...", and I can't do anything. This behaviour is reproducible. Proposed fixes:
* Improve performance of loading large text messages (on the old iPad I'm writing this the same message loads in about 10 seconds)
* Make downloading and loading messages interruptible, e.g. with a button "Cancel loading".