I see very similar issue, but with Core i7 Sandy Bridge, Intel HD
Graphics 3000 built in, which makes me think - this is nothing to do
with NVidia, but rather with Compiz. The desktop effects like moving
between virtual desktops is buttery smooth and the suddenly it goes very
jerky and slow. It stays this way, until I go into CCSM and disable
unity plugin, then re-enable it back - it is buttery smooth again.

I think, this is related -
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/888039

Some details about my setup: I'm using 2 displays of different sizes and
resolutions: 1920x1200 + 1600x900.

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https://bugs.launchpad.net/bugs/1032187

Title:
  Major OpenGL performance degradation over time

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