[SOLVED] GT520 + linux54 5.4.85-1 + linux54-nvidia-390xx 390.138-2 = absolutely terrible performance

Support Graphics & Display
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[[Stable Update] 2020-12-30 - Kernels, KDE, Cinnamon, LibreOffice, Python 3.9, Mesa 20.3.1]

  • Firefox is unbearably slow and is consuming 100% CPU, I can barely type this post
  • games are running at slide show speed
  • GUI is noticeable slow(ish), too

Solved. By adding

Section "Files"
    ModulePath "/usr/lib/nvidia/xorg"
    ModulePath "/usr/lib/xorg/modules"
EndSection

to /etc/X11/mhwd.d/nvidia.conf (the problem was loading the “wrong” libglx.so with llvmpipe as a renderer) (as suggested in this Ubuntu thread)

More experienced forum members: please help me to improve this post.

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Thank you, worked for me!