The meeting itself
Jitsi Meet
The published load tests are exactly what I want before a board call: over a thousand streams at roughly 550 Mbps for about 20% CPU on a quad-core Xeon, on a Selective Forwarding Unit that relays rather than mixes, with Last N mode for large rooms. What holds it back is the bad day — on the public service all users are moderators with soft controls, we found no public information on breakout rooms, waiting rooms, room-system support or behaviour on mobile networks, and the hosted demo carries no uptime commitment and is expressly not meant for production use.
Nextcloud Talk
The capacity honesty is rare and I credit it — '6-10 participants, up to 20 if all participants have a good network connection and do not use video' for private setups, 'thousands' with the enterprise backend — but screen sharing, mute-all, adaptive behaviour on a bad connection and post-call diagnostics are nowhere on this sheet, and the webinar lobby that would serve as a waiting room is gated behind the HPB.