- With large accounts (such as mine), Conversations starts hitting up against
the default heap limit pretty quickly, at which point it grinds to a halt as
GC pause times increase.
- Furthermore, it's impossible to complete a backup with such an account, since
Conversations will just run out of memory before the backup can complete.
- Enabling the `android:largeHeap` flag asks the OS for a bit more memory, which
hopefully alleviates the problem for larger accounts.