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Before / after side by side comparison video:

https://user-images.githubusercontent.com/65677710/151421432...

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(This and 2 other videos are linked in PR conversation tab: https://github.com/obsproject/obs-studio/pull/5875)

The weird thing to me is that it's not just lower CPU/GPU for OBS, but lower GPU for the game. Maybe just a coincidence, since the CPU fluctuates so much between the two.

Heavily speculating but it's not unreasonable that the recording process impacts the game fps. Eg if you had 2 processes trying to max out your CPU it'd be less efficient than doing them one after the other because they're fighting for resources, doing context switching (losing cache etc).

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