Free Nvidia Geforce Driver Download
Download the latest GeForce drivers to enhance your pc gaming experience and run apps faster. Automatically scan your PC or search the driver database for compatible GPU drivers. Free Download NVIDIA GeForce Graphics Driver 314.22 for XP (Graphics Board).
Download drivers for NVIDIA graphics cards, video cards, GPU accelerators, and for other GeForce, Quadro, and Tesla hardware. US / English download.
Posted in the tech support thread as well, but will probably get buried there. No idea if it will improve performance on other cards.
Download the 314.22 Nvidia driver here: http://www.nvidia.com/object/win8-win7-winvista-64bit-314.22-whql-driver.html
Laptop version: http://www.nvidia.com/object/notebook-win8-win7-64bit-314.22-whql-driver.html
Steam discussion: http://steamcommunity.com/app/374320/discussions/0/365163686081153774/
Edit: Screenshot spoiler from first area after tutorial areas. This view used to be single digit framerate at lowest settings: http://i.imgur.com/pOxAYFp.png
Nvidia Geforce Driver 381.65
Settings (720p): http://i.imgur.com/FPnjIX5.png
Specs: GTX 560ti, i5 2500k (stock clock), 8GB RAM, Windows 7.
Edit2:
People are reporting improvements with:
460
465
480
560 ti
560 SE
570
580
640
650 ti
660
Some are reporting that it does not work with Windows 10.
Some are reporting that it does work with Windows 10 ¯(ツ)/¯
This driver version supposedly has improvements for Windows 10 users: