Latest 3.012 update and intense interface lag

Is anyone else experiencing extreme lag in the FF interface after the latest 3.012 update?

It used to be that while a sample was rendering, I would be able to move around the interface, adjusting settings, or even just clicking fr om one preset to another.

Starting immediately after the 3.012 update it's like the entire interface freezes up, sometimes for as much as 5-10 seconds. All of a sudden FF behaves as though I were running it on a 10 year old computer, wh ere before the 3.012 update I never had this lag and freezing. Even opening up the filter editor freezes the app and the editor doesn't open for as much as 15-20 seconds. Something is definitely off since the latest update.

I reinstalled FF and it seems to be running more smoothly now. Not sure what that issue was.