I have an old R710 with 24 cores and 32GB I got on ebay for $200 in my dining room with 10mbits upload/100 download and it works great. bought my .me domain for $5. It's a wonderful time to be alive.
I’ve run 10-12 users with video and desktop screen sharing on a 6 core azure vm with between 20-30% cpu load with spikes to 46%. It also depends a bit on the adaptive bit rate. Image quality of FaceTime is higher than Jitsi.