Has to do with the network, because moving between offline parts of the game move normally but using anything that gets information from the net will result in slight delays. Should clear up on it's own in a matter of hours.
EDIT
I quit playing as the hanging draws me out of my groove. Besides I have some things to pick up including a PSN card to get my DLC. PD sure is moving quickly with patches since 2.0 went live, I wonder if it's because they have paid for DLC? Oh well hope this continues, this game just keeps getting better, now about those leaderboards, I don't really care for them but lots of people do and well it said that there were going to be leaderboards on the back of the box and where are the game invites while in game? Never ever seen that. XMB needs an overhaul Sony, fix it so it integrates better with games that are loaded up.