I have noticed several severe lag issues since the update, as well as having to wait 5-6 minutes just to transition between areas, though a couple of times the loading screen was so long that I decide
They already acknowledged the problem - they added new loading screen art for IC with Orsinium update. Means they will change the pictures with each DLC so we don't get bored.
I got one of these the other day and decided to wait it out, after going afk a few times I was still in the load screen until eventually I got kicked to the login screen for inactivity...