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I installed Ubuntu 16.04.1 (ubuntu-16.04.1-desktop-amd64.iso) dual boot alongside Windows 10. Installation went smoothly until a restart. I boots up very quickly, but after I log in everything becomes unusable. Even simple menu button click takes like 5 seconds to process. Everything is extremely laggy, meanwhile on Windows everything runs perfectly.

I need to use Ubuntu for certain software, could anyone point me to the solution or a at least give a hint?

P.S. I know what does it look when software renderer is used instead of GPU drivers. My case is much worse. It is not only about UI performance, it is about performance in general.

My PC specs: ASRock motherboard with Intel H170 chipset, Core i7 6700, 16GB DDR4, 480GB SSD, Nvidia GeForce GTX 1080

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Reset to default
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Problem solved by installing proprietary Nvidia graphics driver.

I noticed that Xorg process has been using 99.9 of CPU

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