Slow responsiveness when reopening from idling state.
So when Skype is idling on background and then we reopen it, it takes a bit to get on running. While other messaging apps respond almost immediately, Skype demands 3-5 seconds. It is not uncommon also to crash in this process, both on Windows and Android. I think the Skype is going the right way, all the new features, technologies and the new interface are amazing, but the responsiveness and velocity are still a weak point (it always was king of sluggish). Now Skype received a lot of new features,I think the next updates should be focused on killing bugs and making it faster.