Similar story here. I had a laptop running nVidia/Intel dual graphics for a few years and it was so fucking finicky. Primusrun this, optirun that. Ugh. Once upon a time, whenever I heard the word Optimus, I thought of transforming trucks with laser guns. Hearing that same word now puts me in a fetal position.

To any GeForce owners that are considering going Linux full time: do a test run first and see how it works out, because nVidia support on Linux is spotty at best.

A common issue with those hybrid graphics is that it simply doesn't switch and only uses one. Are you sure you're not just using either integrated graphics or your dedicated GPU all the time?