On my machine I get less FPS on Linux compared to Windows. But that can greatly differ depending on hardware and type of games. I have a pretty old hardware.
It probably depends heavily on the game, see e.g. https://www.protondb.com/.
That said, it’s absolutely not unheard of that people have seen higher FPS, even in games that were running through wine/proton, but it heavily depends on what the actual game is, and how new it is (as older games tend to get better support with time).
This essentially is true for most Linux distribution.
One thing not mentioned is disk space: if you don’t enable auto garbage collection or run gc, you are likely to run out of disk space rapidly. This obviously depends on how often you ‘rebuild’. But for beginners its often many times before you get it right, because you need to move slowly or you will wind up in a knot of unfathomable errors. With a 500gb disk you also also need to think about how you will partition your disk. And creating VMs, even small ones, space will be a real issue.
My tip from bitter experience is use flakes for you configuration or maintain a simple backup of your config.
After all my negatively I think Nixos is great but cannot stress enough the vertical learning curve (not really a curve its a step function). If you are fine with Arch then you should be ok with Nixos.
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True but most likely i play THE FINALS cuz it’s so much fun but it is heavy idk how much it will drop me cuz i play it at 60 fps in 900p with fsr 3.1 performance sooo idk
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mine is new it is a 2024 module like average new but i don’t have a dedicated graphics card only integrated 
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I happen to have experience with arch for like 4 months with my secondary laptop i didn’t have a problem with it the only thing that i don’t wanna go back to arch or let it be my main laptop is because of u fix things more then u browse or work or even play games on it another thing is that i felt like addiction to always customize it, it is fun but i don’t wanna break things and another one about firmware and somethings was not responding like camera and audio card was not responding aand about the AUR attack.
But most likely i still gonna do a challenge for a month with nixos and i will see if i will let it be my main destro.
I switched from Arch to NixOS, and now I spend even more time on customizing and fixing stuff. xd
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I switched last summer from Debian to NixOS after 15 years. I switched on my laptop, desktop and server and I’d never come back. I’m mainly doing OCaml for my dayjob, and it even changed completely my workflow. I was using opam, the OCaml package manager, but now I’m exclusively using Nix. I love it and we’ll never come back.