I'm recording gameplay at 60 FPS, various Steam games and on an emulator (PCSX2 specifically) and the recording just becomes a visibly lower frame rate for 3 to 5 seconds, but then returns to normal. It happens every 10-20 seconds or so and the actual gameplay itself is always perfectly smooth without the slightest hitch. It's only when I go to finally check the recording that I see any decrease in frame rate.
A visual example: https://www.youtube.com/watch?v=VhSOjDHOtcw
A visual example: https://www.youtube.com/watch?v=VhSOjDHOtcw