Where is the Speed?
What happened if it responds too slowly?
Nobody cares that your app is slow because every time it reloads data over a slow internet connection or it is the CPU of mobile that is affecting its performance. All they want is speed… While developing app, be careful about large images and backgrounds that have to be loaded and stored. User should also have facility to cancel the operations that are taking too long.

Great list of mobile apps deadly design sign , It will Definitely Help Mobile apps designer and developer 🙂 Keep it up !
Btw , Nice Images !!
Thank you for sharing
We at WedigTech always make apps elegant, effective, effortless and enjoyable.