I heard Sayu mention[1] that she uses two PCs, a gaming PC and a streaming PC.
Is she capturing the video and audio output of the gaming PC from the streaming one with a video capture card like an Elgato? If so, that's pretty smart, because then she dedicate her gaming GPU 100% to the game, without burdening it with the vtuber model, video encoding, Youtube Chrome tab, and other random things.
But I've never heard any other vtuber doing this. In fact, every other one has had the occasional trouble with their stream dropping frames when some heavy game is loading. Did she come up with this idea herself? How is this cyborg so powerful?
[1]
https://youtu.be/NCRrVS5PI1Y?t=270 