Hello,
Even after upgrading to the latest version, we were still having the performance issues with GetLobbyInfoArray(). We had to remove that method call from our code, thus giving up showing the information about the number of connected users in our custom page.
Moreover, performance issues seems to happen also when some number of users are online (around 40-50) and new users try to connect to the chat load balancing server.
Fabrizio Cipriani