Okular is the best I’ve found

Some people are driven primarily by ambition, it’s not unheard of for a newbie to bite off much much more than they can chew. Depends on their humility

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Skill issue

I’ve heard that KDE has a cube effect

I use Mint for my main gaming PC, FWIW, totally rock solid

Another thing you might want to try is Mint with the Mate DE, which is based on old GNOME 2 code (and therefore can load the old add-ons like the 3D desktop cube etc)

It is a singularity, in the sense that it is an infinitely escalating level of suck.

I’d recommend CachyOS if you’re trying to squeeze the best gaming performance out of the hardware