I have also patched my 295.33 now, my glxgears is running normal with the security patch applied, which is good.
The only game I have available and I can try the patch with is Diablo 3 Beta build.
Without the security patch I have around 20-45 FPS.
With Security patch I have max 6-8 FPS max.
I know that the game is not a good reference, since it is beta and not even supported for linux. But I just wanted to mention it since something seems to happen with the graphic performance even if it is just a security patch. Users on the arch-forum also mentioned they still had problem with the patched 295.33. (https://bbs.archlinux.org/viewtopic.php?id=139535