[PC] Dragon Age Inquisition: Sudden bad performance, fps drops/lag

UPDATE 5: This seems to have made the game worse. In starting a new test game, after the very first opening cinematic where you escape the fade, the character model and Cassandra dropped into a map I've never seen before, looks like somewhere with the ledge you climb in the opening cinematic in the background. My character has maybe 10% health, no weapons, and no skills, taking damage. I think I'm going to update the drivers again...Going to try other suggested fixes.