The issues related to logging in to the European Xbox megaserver have been resolved at this time. If you continue to experience difficulties at login, please restart your client. Thank you for your patience!
Freezes seem to be related to Zerg Battles, if you are in a group fighting another group, one group mass freezes (20+ players at the same time) and the other one is fine.
The current performance issues on console are currently being looked into. You can find more information and continue the discussion in this thread. We are closing this discussion.