After downloading patch 3, I've noticed significant lag in certain behaviors. There is a noticeable delay between when you initiate a conversation and when it actually starts. Spell animation is taking a few seconds to occur after you cast a spell. Companions in your party delay following you (at least graphically). The delays are long enough that it really hampers the experience. It would be great if you could look into this and figure out/fix the cause.
Hmm, no noticeable lag on my end (PC version). I just ran a quick test talking to several companions after installing patch3. Do you have mods installed by any chance?