I wonder if the slowness is related to this from your Xorg log:
[ 137.718] randr: falling back to unsynchronized pixmap sharing
** Tags added: nvidia
** Summary changed:
- Description
+ Slowness and sometimes the computer freezes
** Summary changed:
- Slowness and sometimes the computer freezes
+ [nvidia] Slowness and sometimes the computer freezes
** Tags added: hybrid
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Also affects: nvidia-graphics-drivers-390 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1840626
Title:
[nvidia] Slowness and sometimes the computer freezes
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