Enable <a target="_blank" rel="noopener noreferrer" href="https://docs.joinpeertube.org/admin/configuration#live-streaming">live streaming</a> for your instance
Except for video transcoding, a PeerTube instance is not CPU bound. Neither Nginx, PeerTube itself, PostgreSQL nor Redis require a lot of computing power. If it were only for those, one could easily get by with just one thread/vCPU.