Hi DarkRanger, the most likely cause is that with over 2000 online characters online...you're going to get lag, either
CPU lag (low FPS) or server lag (high ping).
Either way, with that much action on your screen at once...there's not alot that can be done. Your best bet is to close any software that's not necessary.
You'd obviously have some team speak sort of software to talk to your alliance, but give it a test without this running - as it will be a drain on your computer.
Another possibility - if you only have 1gb of
RAM, I'd suggest upgrading to 2gb...this might help a substantial amount.