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0e1f616
(Get the code!)
I was waiting for an update before reporting that I was affected. I have installed 295.49 and it has not fixed my problem. The same issue exists with 259.33 and 259.40. This is new behavior in 12.04.
I have a G96 [GeForce 9500 GT] (from lshw)
When I first boot up, video is fast. After a period of time, certain applications become very slow, taking seconds to do what had previously been instantaneous. A graph using the rgl package in R, for example, comes up as a grey box for several seconds, and resizing the box takes seconds. When I first boot, all of this is instantaneous.