> When joining a room, it has to sync everything since the last time the client connected, or in some cases, a ton of history, like megabytes of it. Not sure I

> When joining a room, it has to sync everything since the last time the client connected, or in some cases, a ton of history, like megabytes of it. Not sure I understand. Does it block the UI? Or is the author saying it has to do this before you can send a message?