How to solve low performance on Ubuntu 15.10 with nVidia 650M, various drivers?

Last week I installed a SSD and formated my Ubuntu 14.04.3 to install Ubuntu 15.10 with UEFI, root and swap on SSD, /home on HDD, overall disk access speed much better. But the problem is: graphics become so much slow, it freezes on single and network games (tested on XCOM, Civ5, Dota2), timouting on the last.

I emphasize that it not happened on Ubuntu 14.04.3 within the same conditions and same driver.

I tried everything I could, reformatted and reinstalled Ubuntu 15.10 two times and I would thank you very much if you have any clue how to solve this problem.

nvidia-352 was apt-got with xorg-edgers PPA added, all times.

I gave up on Optimus technology a long time ago, my notebook is used as a compact wired desktop, so, no problem, let the battery go.

• $ lspci | grep VGA

01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 650M] (rev a1)

• $ cat /etc/X11/xorg.conf | grep version

version 352.63 (buildmeister@swio-display-x64-rhel04-11) Sat Nov 7 22:00:19 PST 2015

http://pastebin.com/1hNmsxPT

• $ ubuntu-drivers devices

== cpu-microcode.py ==
driver : intel-microcode - distro non-free

== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
vendor : NVIDIA Corporation

model : GK107M [GeForce GT 650M]

modalias : pci:v000010DEd00000FD1sv000014C0sd00000066bc03sc00i00

driver : nvidia-304-updates - distro non-free

driver : nvidia-340-updates - distro non-free

driver : xserver-xorg-video-nouveau - distro free builtin

driver : nvidia-340 - distro non-free

driver : nvidia-304 - distro non-free

driver : nvidia-352-updates - distro non-free

driver : nvidia-352 - distro non-free recommended

Tried all seven drivers, same problem.

Typical conditions with Sync to VBlank enabled. Some FPS drops on glxgears, but during freezes it won't drop enough to justify, stays almost the same. Temperature is normal. CPU is a Intel Core i7-3630QM.

http://imgur.com/KVCgFhI

Generally you should use the drivers from the official Ubuntu repositories. But when there are problems with the drivers ... you can install the more current drivers from the GPU Drivers PPA.

Uninstall the currently installed NVIDIA drivers and remove the xorg-edgers PPA.

Open a terminal and execute :

sudo apt-get purge nvidia*
sudo apt-get install ppa-purge
sudo ppa-purge ppa:xorg-edgers/ppa
sudo reboot

You can install the latest official NVIDIA drivers that support GEFORCE GT 650M.

Open a terminal and execute :

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-358
sudo reboot