We just deployed a Jitsi server on a Debian VM and chose to test how many
participants we could have in one room at one time. We got about 38
participants connected with no issue -- the only minor nuisance we've
noticed is that the userlist at the bottom doesn't wrap -- it just keeps
shrinking the thumbnails, and with 30+ participants it can get difficult to
read the participants or see their webcam thumbnails.
Users are also unable to scroll the list of participants.