You don't seem to understand what I meant:
If 90% of the players experience lag issues, but 10% can login and play just fine, it's very unlikely that it's due to the server. It's more like, it has to do with the connection between you and the server. People using different internet service providers connect differently to the server. Maybe some connection is damaged or too busy to handle requests, so if 90% of the players' ISPs are using this connection to connect to the server, they'll experience lag, but the 10% who are using a different connection, are able to play flawlessly.
The server is working fine, and for me (I am from Germany), both forums and game are working without lags or DCs or anything. If it was server related, EVERYONE would be experiencing the lag issues. It seems to mostly affect American players, though, and as the majority of the players are from the states, well, there you go.
That means: There's not much I can do right now. Let's just wait to see if it gets better after a while or tomorrow or so.