1 144hz monitor and a 60 hz monitor?

I have a 144 hz monitor aoc g27c1 and would like to have a 2 only for Netflix discord or opera or so, since I don't want to have 2 monitors for 250 euro now, I wanted to ask if I could simply connect a 60 hz monitor so that I can on one 144hz and on the other 60 hz. A friend has already tried this and had a performance raffle and fps drops I have an rx 580 and an i5 8500 g

Yes you can.

Of course, a second ad also needs additional resources - and depending on what's running in the background while you're playing, that can have a big impact

Then you have to run the games or applications in windowed mode or borderless with extended desktop as far as I know, otherwise the graphics driver wants to pay full attention to the full screen application.