Hello, I made upgrade of NVIDIA drivers to experimental 310.14 ( sudo apt-get install nvidia-experimental-310 nvidia-settings-experimental-310) and performance in Unity rapidly rised up. Glxgears with previous drivers (NVIDIA 304.x, 290.x) took max 2400 fps, with 310.14 it takes about 3100 fps. I must do more tests, but it looks, that problem was in NVIDIA drivers, as Daniel van Vugt (vanvugt) wrote on 2012-10-18.
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