After today's patch game isn't nearly as smooth as it was on release, not mentioning yesterday's patch that allowed me to disable AA. Now it's stuttering when I look around the map and I have really low framerates judging from moves of characters. It's barely enjoyable now, really.

 

Now I admit my gear isn't nearly top shelf (notebook with i5 430m, mobility radeon hd 5650, 4gb ram) and I do play with full hd resolution, which is more than my notebook was designed for, but the game worked just fine before this patch.

 

I noticed some fog effects when I fired up the game. Not sure if it was there earlier. Did the patch add some effects that may be the cause for my performance drop? If yes, is there a way to disable them? My graphic level slider is all the way to the left.

I had the exact same problem late last night and this morning. Tried everything and it didn't improve, did a full system reboot and it seemd to have been completely fixed. Unsure if you'll have the same experience but maybe it will help!

I solved the problem on my side. It seems my GPU went into energy saving mode for some reason, coincidentially after I downloaded a patch. Sorry for bothering anyone.