I don't record a lot, and usually it is just a short clip when I do.

When I play the game (7 days to Die) with everything on LOW graphics settings I get 100 FPS or more.  

As soon as I start OBS the in-game FPS still shows the same values, round-about the 90 to 110 mark... but the display stutters.  It is especially bad when you just turn from side to side.  Note that this is not even recording - OBS is just running on another monitor.

I don't know what to call this display stutter.  It looks like low fps but the game still shows 100 fps (Using F8 to show the in-game fps counter)

Note that it used to be OK but then after installing updates I noticed that it is no longer any good.  Unfortunately since recording is something I often don't even think about for months between recordings I can't pin-point when it went bad exactly.

I had good results in a previous major version of the game, but since then I've also had updates to OBS and to the operating system, and possibly significantly I'm on X now where I used to be on Wayland.  Perhaps I should try to get Wayland working.  I really noticed the issue after essentially everything updated in a short space of time - OS, OBS, and the game all updated in a matter of a month so it is really hard to tell where the issue comes from.

For what it is worth: I am playing on an entry-level gaming laptop - MSI Leopard 8RE, i7 8750H, 24 GB ram, M2 and SSD drive, Nvidia 1060 mobile (6GB), running KDE neon 5.19, which is Ubuntu based with a current 5.4.0 kernel and Nvidia drivers 450.66.  OBS is version 25.0.8