In another thread it has been noted that AMD graphics users have had various degrees of problems since the patch.
I haven't seen anyone with nVidia graphics note those particular problems (though people with SLI occasionally report performance issues).

I recommend AMD users start experimenting with various in-game and driver settings to see if it helps anything, as that could also speed up anything SE can do to help fix it. Enable or disable occlusion culling and other things as an example.
Anything that is actually caused by the game should obviously be fixed by SE, but every bit of feedback helps.