I just set up my laptop and I want to make it easier for other users. Im using the one with Intel UHD 620 and have added additional 4GB of ram (8GB total). For steam games I use steam native with proton ge custom, for heroic and gog I use heroic (dont confuse with this one which did not work for me and the PKGBUILD seems weird)
To increase performance:
- I made sure packages mentioned here were installed and that xf86-video-intel was uninstalled
- Installed intel-media-driver and made sure linux-firmware (which is installed by default at the moment of writing) is installed (see this page to know why)
- Enabled zram
I also recommend reading this guide.