Using Nvidia propriety driver version 9755 allows using AIGLX instead of the slower and deprecated GLX interface.
AIGLX nowadays is part of Xorg 7.1 and above.
You can find a guide in OpenSuse Wiki which will describe the required actions.
I have attached here my own xorg.conf file which allows Dual-head setup with 2 LCD screens running resolution of 1280×1024 for AIGLX: xorg.conf-Nvidia_AIGLX.txt
It appears that it doesn’t work quite as well yet – at least not with the xorg.conf file I have uploaded here. You will require two additional lines, as described in Ubuntu forums. The up-to-date file is this: xorg.conf-Nvidia_AIGLX_fixed.txt