Performance has been and continues to be a big focus area for Teams. One main area we have made improvements in is responsiveness for the most frequent user actions of switching between Chat, Channel, and Activity. We are also focused on reducing resource consumption and application load time. More improvements are on the way.
This feature request is still on in the backlog. No new updates available at this time.
Integration with Skype Consumer is no longer under review, and officially planned.Phil Carbone commented
At my company a lot of people have teens at home during the summer, etc. It doesn't make sense that they have to run another app just to communicate with people. In 2017+ communication, federated, is just a must. Especially if MS owns the communication channel. I am the decision make at our business in regards to this stuff, and not being able to bridge Teams over to the public skype is a huge problem - administrators should be able to choose what makes sense at their business (enable/disable public skype)