Vaunted security hampered by unreliability

A trusted security expert has touted the solid end-to-end encryption provided by this app, and I purchased it based on that recommendation. I have no complaints regarding the apps security.

The problem is server reliability. Each outgoing message is timestamped -- in a separate screen available after long-clicking a message -- to show when it was sent and when delivered. (There is also a "when read" timestamp, but that has no bearing here.) Over the course of the past weeks and months, the timestamps show frequent delivery delays of 20 minutes, 30 minutes, and sometimes even hours. Some messages are never delivered. These frequent long delays defeat the central requirement of a working text message system -- conversations that happen in near real time. Its like having a car with revolutionary safety features that only starts half the time, or stalls for 30 minutes every few trips. It is unacceptable. I want to love this app, but I cant recommend it.

Update 12/23/2015:

Constant server delays continue to render this messaging app useless. I keep testing to see if there is some improvement, but I am consistently disappointed.

Sammi643573 about Threema. The Secure Messenger