i'm not sure, but i'll bump for you. and out of my own advice, don't use those addons that have the animated portraits, seriously, what a waste of fps. (and if it actually doesn't drop fps, anyone who is reading this has permission to laugh at me)
1: Download Driver Cleaner Pro
2: Download the latest nVidia Drivers
3: Follow the instructions on Driver Cleaner Pro Readme file, which will help you to remove the old and install the new drivers
4: Go to nVidia control panel and change this (It will be in "Adaptive", change to "prefere maximum performance".)