I've had this issue since Ubuntu 9 and now even on Linux Mint 17 no matter what latest version of the Nvidia proprietary driver that I use.  It just becomes slower and slower and only gets better after rebooting or restarting Xorg.

Someone here has it as well

https://askubuntu.com/questions/822449/graphics-becomes-slow-after-a-while/917886

It's very frustrating that this issue has been recurring with all OS's, drivers and different Nvidia cards I've had with no resolution.  I am almost considering going ATI if that driver doesn't have the slowdown issue

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