So: let's take Minecraft as an example. I play normally at 60 fps and record with obs on the side. I don't have any problems while playing, but when I look back at the recording, it jerks. From the fps everything is good. The problem is, for example, that if I move my mouse, that is, my view with the player to the side, it jerks a lot, if I only walked straight ahead, that wouldn't be. Of course I'm now wondering what the problem is and I want to fix it urgently.
Show the statistics in OBS. There you can see if frames are being dropped because of rendering delay / encoding delay. You may have to adjust your recording settings accordingly.
Okay and how do I show this?
View> Docks> Statistics