Like, is there a limit to how many people can be on it at once? Or is there a number where it just stops working at?
There is no limit. I've been on when a lot of people have been on, and it's always worked pretty well.
It may slow down with 100+ people all on at once but it's unlikely to stop working.
I'm sure there is no limit to the amount of people in the chatroom! l remember maybe two weeks ago, we've had about ten or twelve people in the chatroom talking at once.