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

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).