Yup,
Masters is laggy, signing in takes time and it all turns into frustration. I can completely understand that and there's no excuses for such performance issues. It can take another try or two before players can move forward from the loading screen, and then it can take more time to open different game windows, set schedules etc. At times it works better and at times it's like pulling the trains yourself out there...
I hope to bring good news soon and again, we are sorry for these performance issues and for all the frustration this has caused you.