i heard a lot of people complaining about that yeasterday. i lagged a lot myself yeasterday too
game suffered a few changes these days. they changed sound settings, and are now asking permission for unlimited storage space when we log in (which is annoying, considering they ask for it even if it is already set to unlimited)
My guess is that they changed memory usage too, and that is causing trouble for a lot of users.
Please use ingame support and complain about it!
The more ppl say they screwed with game flow the better. Maybe they will take us seriously.