crispycat - Codeberg.org

Something that happens quite often with Matrix (specifically using Schildi/Element) in my experience is scrolling occasionally bugs out with large amounts of messages, making it impossible to...

I assume they're on the same infrastructure and therefore on the same network

tracking users in public room

For matrix, matrixrooms.info may be a good starting point for servers and rooms. As far as counting users there is to my knowledge no way to do this independent of a specific server.