I've had the exact same issues since the DDOS occurred a few weeks ago. I have 10 - 15 second Lag on most actions, sometimes the music for the location doesn't load, the game freezes whilst trying to talk to NPC's (I've also had the issue with the log in screen) I'm playing on PS3 as well, with a wired very strong connection.

I originally pinned the issue down as being a result of the DDOS attacks and gave it some time to see if resolved itself, which it hasn't.

Hopefully some light can be shed on it.