Performance impact of File Recording

I was wondering, how heavy would be the impact on the CPU/GPU load of launching a File Recording output in MimoLive during a show?
I guess it depends on the Mac configuration as well as on the codec…
I’d say that using for example a ProresLT is not so heavy on the encoding as using H.264 or HEVC…?

In a 2018 MacbookPro, with a few graphics and videos and ATEM cameras, what would be the lightest load on the processing power? I don’t want to take any from the “on-air” needs of Mimo…