Could you please try both:
(a) An older version of the nvidia driver that is supported in Ubuntu 12.04:
https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers
https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers-updates
(b) Removing NVIDIA drivers completely (assuming the default fallback
"nouveau" driver works for you)
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https://bugs.launchpad.net/bugs/1032187
Title:
Major OpenGL performance degradation over time
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