Also experiencing this.

Started when I walked into Blackrock Cove.

Not internet related, and the game was working beautifully up to this point.

mid-2010 Macbook Pro, OSX updated
i7 processor
4GB RAM
NVidia GT 330M 512mb

Other games like XCOM: Enemy Unknown, Diabo III, etc. work fine at medium settings, but now even at 'very low' this game does not run at a level which is playable.