OK wait, your in games now? Steam games? Alright, if so, the problem you might be having is the same as this other persons. Please follow the detailed instructions that I have already provided for the other user...
Often times when a game is able to launch without PROTON, it can lag. Selecting a PROTON version is the only resolution often times to smooth out the game, and stop it from lagging.
Also, do you have the Nvidia Prime indicator extension installed from Gnome-Extensions website? That extension will install to the right of your taskbar, it will allow you to select just your Nvidia GPU, which will require a restart after selecting it.
This basically tells your system to PREFER Nvidia GPU. You want your power options set to high performance.
https://extensions.gnome.org/extension/1275/prime-indicator/
