I am running Manjaro KDE on two general purpose PCs, both with Nvidia graphics, both without problems.

On my living room gaming setup (also Nvidia), I am running Bazzite, which also runs very nicely.

Which afaik runs very well under Linux.

I think I have some bad news about your ex gf 💀

Are you using multiple screens and have something open on another screen that periodically rerenders? I have had a similar problem when having Ksysguard open on a second screen - every time the graphs rendered a new time step, my game lagged. Only happened on Wayland. My solution was to run the game inside of gamescope or to close the offending application.

Yes, you can either add external games inside steam and set their compatibility options to use some version of proton or use proton through lutris or manually.

Chrome […] is spyware. Don’t use chrome.

There is no causality there.

If you worked on smithing knives sorry but you must have known eventually someone would get stabbed

If you worked on building cars sorry but you must have known eventually someone would drive one into a protest

If you worked on producing painkillers sorry but you must have known eventually someone would trigger an opioid epidemic for their personal gain

…

A tool is a tool. Regulation and responsibility determine the associated dangers.

Where are you getting these numbers? I have a 3080, used a 1080Ti before, and though my last direct comparison was a while (like a few years) ago, I had more like 3-5% difference in FPS in the games I tested, at most 10% in RS2 Vietnam, but this ultimately turned out to be a CPU bottleneck. I would assume (and, reading reviews on reddit, this seems confirmed) that the drivers have mostly gotten better since then.

When was the last time you used an Nvidia card under Linux? There are no performance issues compared to windows, haven’t been any in YEARS.