System is sluggish after system upgrade

I cannot translate the GPU information - I don’t have a similar system.

Which GPU is in use?

Just speculations and something for you to experiment with.

Selectively removing plasma configuration files may help → Applications / Manjaro Plasma Reset · GitLab

The inxi output seems to indicate it is your intel GPU driving the show - and your desktop seems to be x11.

With plasma 6 the focus has shifted to Wayland and Intel on wayland works without known issues.

Please see The issue with Plymouth and the Black Screen if you want to use Nvidia as it does appear to be everything but a walk in the park.

Current testing sync can be followed [Testing Update] 2024-06-11 - Mesa, KDE Frameworks, Octopi, LibreOffice - #2 by philm for known issues and possible solutions before they reach stable