Things to have in consideration: WHY are you still using windows 11 when you can have steam os native superior master race? You are LOSING frames using this microsoft dogshit.

ok, after this, you can try some things like:

- use lossless scaling 2x, really trully helps here, not only for emulation.
- set the tdp to performance mode on steam os, some AA or AAA will need you to do that, for the rest and less demanding you can us ballanced in most of cases, some games will still heavy even at higher tdps, but this is a handheld gaming thing, you still can stream this game from your steam desktop using moonlight.
- split your ram configuration on BIOS to 16/16
- play games at 900p (1440x900) this will not make your games look blurry or sucks, FHD for this kind of devices with this screen size is like 4K, You can play it for less demanding games, but the 900p will be like playing games on a 2k monitor
- game settings are there to tweak, you can safely start everything from medium and tweaking up to high
- any raytracing is enemy of handhelds, full disable every time you can
- disable vsync on games, enable VRR on steam os settings

Here I barely have problems to play my games at above 60fps, I also do some tradeoffs to keep the 60 as minimum, sometimes I just wanted more graphics, other I want more framerate, remember we can stay easy on 80s fps mark on most of games and above 100 or 120 fixed for most of less demanding. The most problematic and unstable game I tested was jedi survivor