Since the patch my game will start dropping frames like crazy after a couple of hours online. I will go from 59-60fps to 1-10fps forcing me to close client and relog to fix issue. Happens in dungeons, in towns, in the world. I've found that if this occurs while in a dungeon enemies will be invisible with just a target bar for me to go off of.

Lowering the settings all the way to low has no effect on lag so I know it's not my ability to run the game properly.

Win7 64
FX 6300
r9 270x
8gig ram