So if you are experiencing stuttering in games (opengl/directx[wine]) and noticing a huge FPS drop every 6-7 seconds then this is caused probably because you are using an NVIDIA 38X_x driver which is reported to have a VRAM-BUG issue.
Link about the VRAM-BUG:
https://devtalk.nvidia.com/default/topic/1026874/linux/huge-performance-losses-with-newer-nvidia-drivers/post/5223375/#5223375
1) First of all open your terminal and check what is your gfx driver version:
inxi -F && dmesg | grep -i error
2) After that run also:
glxinfo | grep OpenGL
3) Open your Driver Manager and select nouveau as default driver:
4) Time to remove all nvidia drivers from our Unix System:
sudo apt-get purge nvidia*
sudo nvidia-settings --uninstall
5) Now lets install nouveau and reinstall some packages
sudo apt-get install --reinstall libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core xserver-xorg-video-nouveau
6) Make sure that nouveau is not blacklisted:
cd /etc/modprobe.d/
ls
7) Reboot your system
8) Download the 375 driver (nvidia-375_375.39-0ubuntu5_amd64.deb)
http://us.archive.ubuntu.com/ubuntu/ubuntu/ubuntu/pool/restricted/n/nvidia-graphics-drivers-375/
9) Install the new driver , follow the steps for the MOK and SecureBoot(Disabled).
10) Thats it. Restart your system and try out the new driver.
11) Before launching a game check the driver version by running again
inxi -F && dmesg | grep -i error
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